--- _id: '14793' abstract: - lang: eng text: Superconductor/semiconductor hybrid devices have attracted increasing interest in the past years. Superconducting electronics aims to complement semiconductor technology, while hybrid architectures are at the forefront of new ideas such as topological superconductivity and protected qubits. In this work, we engineer the induced superconductivity in two-dimensional germanium hole gas by varying the distance between the quantum well and the aluminum. We demonstrate a hard superconducting gap and realize an electrically and flux tunable superconducting diode using a superconducting quantum interference device (SQUID). This allows to tune the current phase relation (CPR), to a regime where single Cooper pair tunneling is suppressed, creating a sin(2y) CPR. Shapiro experiments complement this interpretation and the microwave drive allows to create a diode with ≈ 100% efficiency. The reported results open up the path towards integration of spin qubit devices, microwave resonators and (protected) superconducting qubits on the same silicon technology compatible platform. acknowledged_ssus: - _id: M-Shop - _id: NanoFab acknowledgement: "We acknowledge Alexander Brinkmann, Alessandro Crippa, Francesco Giazotto, Andrew Higginbotham, Andrea Iorio, Giordano Scappucci, Christian Schonenberger, and Lukas Splitthoff for helpful discussions. We thank Marcel Verheijen for the support in the TEM analysis. This research and related results were made possible with the support of the NOMIS\r\nFoundation. It was supported by the Scientific Service Units of ISTA through resources provided by the MIBA Machine Shop and the nanofabrication facility, the European Union’s Horizon 2020 research andinnovation programme under Grant Agreement No 862046, the HORIZONRIA\r\n101069515 project, the European Innovation Council Pathfinder grant no. 101115315 (QuKiT), and the FWF Projects #P-32235, #P-36507 and #F-8606. For the purpose of open access, the authors have applied a CC BY public copyright licence to any Author Accepted Manuscript version arising from this submission. R.S.S. acknowledges Spanish CM “Talento Program\"\r\nProject No. 2022-T1/IND-24070. J.J. acknowledges European Research Council TOCINA 834290." article_number: '169' article_processing_charge: Yes article_type: original author: - first_name: Marco full_name: Valentini, Marco id: C0BB2FAC-D767-11E9-B658-BC13E6697425 last_name: Valentini - first_name: Oliver full_name: Sagi, Oliver id: 71616374-A8E9-11E9-A7CA-09ECE5697425 last_name: Sagi - first_name: Levon full_name: Baghumyan, Levon id: 7aa1f788-b527-11ee-aa9e-e6111a79e0c7 last_name: Baghumyan - first_name: Thijs full_name: de Gijsel, Thijs id: a0ece13c-b527-11ee-929d-bad130106eee last_name: de Gijsel - first_name: Jason full_name: Jung, Jason id: 4C9ACE7A-F248-11E8-B48F-1D18A9856A87 last_name: Jung - first_name: Stefano full_name: Calcaterra, Stefano last_name: Calcaterra - first_name: Andrea full_name: Ballabio, Andrea last_name: Ballabio - first_name: Juan L full_name: Aguilera Servin, Juan L id: 2A67C376-F248-11E8-B48F-1D18A9856A87 last_name: Aguilera Servin orcid: 0000-0002-2862-8372 - first_name: Kushagra full_name: Aggarwal, Kushagra id: b22ab905-3539-11eb-84c3-fc159dcd79cb last_name: Aggarwal orcid: 0000-0001-9985-9293 - first_name: Marian full_name: Janik, Marian id: 396A1950-F248-11E8-B48F-1D18A9856A87 last_name: Janik - first_name: Thomas full_name: Adletzberger, Thomas id: 38756BB2-F248-11E8-B48F-1D18A9856A87 last_name: Adletzberger - first_name: Rubén full_name: Seoane Souto, Rubén last_name: Seoane Souto - first_name: Martin full_name: Leijnse, Martin last_name: Leijnse - first_name: Jeroen full_name: Danon, Jeroen last_name: Danon - first_name: Constantin full_name: Schrade, Constantin last_name: Schrade - first_name: Erik full_name: Bakkers, Erik last_name: Bakkers - first_name: Daniel full_name: Chrastina, Daniel last_name: Chrastina - first_name: Giovanni full_name: Isella, Giovanni last_name: Isella - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros orcid: 0000-0001-8342-202X citation: ama: Valentini M, Sagi O, Baghumyan L, et al. Parity-conserving Cooper-pair transport and ideal superconducting diode in planar germanium. Nature Communications. 2024;15. doi:10.1038/s41467-023-44114-0 apa: Valentini, M., Sagi, O., Baghumyan, L., de Gijsel, T., Jung, J., Calcaterra, S., … Katsaros, G. (2024). Parity-conserving Cooper-pair transport and ideal superconducting diode in planar germanium. Nature Communications. Springer Nature. https://doi.org/10.1038/s41467-023-44114-0 chicago: Valentini, Marco, Oliver Sagi, Levon Baghumyan, Thijs de Gijsel, Jason Jung, Stefano Calcaterra, Andrea Ballabio, et al. “Parity-Conserving Cooper-Pair Transport and Ideal Superconducting Diode in Planar Germanium.” Nature Communications. Springer Nature, 2024. https://doi.org/10.1038/s41467-023-44114-0. ieee: M. Valentini et al., “Parity-conserving Cooper-pair transport and ideal superconducting diode in planar germanium,” Nature Communications, vol. 15. Springer Nature, 2024. ista: Valentini M, Sagi O, Baghumyan L, de Gijsel T, Jung J, Calcaterra S, Ballabio A, Aguilera Servin JL, Aggarwal K, Janik M, Adletzberger T, Seoane Souto R, Leijnse M, Danon J, Schrade C, Bakkers E, Chrastina D, Isella G, Katsaros G. 2024. Parity-conserving Cooper-pair transport and ideal superconducting diode in planar germanium. Nature Communications. 15, 169. mla: Valentini, Marco, et al. “Parity-Conserving Cooper-Pair Transport and Ideal Superconducting Diode in Planar Germanium.” Nature Communications, vol. 15, 169, Springer Nature, 2024, doi:10.1038/s41467-023-44114-0. short: M. Valentini, O. Sagi, L. Baghumyan, T. de Gijsel, J. Jung, S. Calcaterra, A. Ballabio, J.L. Aguilera Servin, K. Aggarwal, M. Janik, T. Adletzberger, R. Seoane Souto, M. Leijnse, J. Danon, C. Schrade, E. Bakkers, D. Chrastina, G. Isella, G. Katsaros, Nature Communications 15 (2024). date_created: 2024-01-14T23:00:56Z date_published: 2024-01-02T00:00:00Z date_updated: 2024-01-17T11:07:55Z day: '02' ddc: - '530' department: - _id: GeKa doi: 10.1038/s41467-023-44114-0 ec_funded: 1 external_id: pmid: - '38167818' file: - access_level: open_access checksum: ef79173b45eeaf984ffa61ef2f8a52ab content_type: application/pdf creator: dernst date_created: 2024-01-17T11:03:00Z date_updated: 2024-01-17T11:03:00Z file_id: '14825' file_name: 2024_NatureComm_Valentini.pdf file_size: 2336595 relation: main_file success: 1 file_date_updated: 2024-01-17T11:03:00Z has_accepted_license: '1' intvolume: ' 15' language: - iso: eng month: '01' oa: 1 oa_version: Published Version pmid: 1 project: - _id: 237E5020-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '862046' name: TOPOLOGICALLY PROTECTED AND SCALABLE QUANTUM BITS - _id: 34c0acea-11ca-11ed-8bc3-8775e10fd452 grant_number: '101069515' name: Integrated GermaNIum quanTum tEchnology - _id: bdc2ca30-d553-11ed-ba76-cf164a5bb811 grant_number: '101115315' name: Quantum bits with Kitaev Transmons - _id: 237B3DA4-32DE-11EA-91FC-C7463DDC885E call_identifier: FWF grant_number: P32235 name: Towards scalable hut wire quantum devices - _id: bd8bd29e-d553-11ed-ba76-f0070d4b237a grant_number: P36507 name: Merging spin and superconducting qubits in planar Ge - _id: 34a66131-11ca-11ed-8bc3-a31681c6b03e grant_number: F8606 name: Conventional and unconventional topological superconductors publication: Nature Communications publication_identifier: eissn: - 2041-1723 publication_status: published publisher: Springer Nature quality_controlled: '1' scopus_import: '1' status: public title: Parity-conserving Cooper-pair transport and ideal superconducting diode in planar germanium tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 15 year: '2024' ... --- _id: '15018' abstract: - lang: eng text: The epitaxial growth of a strained Ge layer, which is a promising candidate for the channel material of a hole spin qubit, has been demonstrated on 300 mm Si wafers using commercially available Si0.3Ge0.7 strain relaxed buffer (SRB) layers. The assessment of the layer and the interface qualities for a buried strained Ge layer embedded in Si0.3Ge0.7 layers is reported. The XRD reciprocal space mapping confirmed that the reduction of the growth temperature enables the 2-dimensional growth of the Ge layer fully strained with respect to the Si0.3Ge0.7. Nevertheless, dislocations at the top and/or bottom interface of the Ge layer were observed by means of electron channeling contrast imaging, suggesting the importance of the careful dislocation assessment. The interface abruptness does not depend on the selection of the precursor gases, but it is strongly influenced by the growth temperature which affects the coverage of the surface H-passivation. The mobility of 2.7 × 105 cm2/Vs is promising, while the low percolation density of 3 × 1010 /cm2 measured with a Hall-bar device at 7 K illustrates the high quality of the heterostructure thanks to the high Si0.3Ge0.7 SRB quality. acknowledgement: The Ge project received funding from the European Union's Horizon Europe programme under the Grant Agreement 101069515 – IGNITE. Siltronic AG is acknowledged for providing the SRB wafers. This work was supported by Imec's Industrial Affiliation Program on Quantum Computing. article_number: '108231' article_processing_charge: No article_type: original author: - first_name: Yosuke full_name: Shimura, Yosuke last_name: Shimura - first_name: Clement full_name: Godfrin, Clement last_name: Godfrin - first_name: Andriy full_name: Hikavyy, Andriy last_name: Hikavyy - first_name: Roy full_name: Li, Roy last_name: Li - first_name: Juan L full_name: Aguilera Servin, Juan L id: 2A67C376-F248-11E8-B48F-1D18A9856A87 last_name: Aguilera Servin orcid: 0000-0002-2862-8372 - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros orcid: 0000-0001-8342-202X - first_name: Paola full_name: Favia, Paola last_name: Favia - first_name: Han full_name: Han, Han last_name: Han - first_name: Danny full_name: Wan, Danny last_name: Wan - first_name: Kristiaan full_name: de Greve, Kristiaan last_name: de Greve - first_name: Roger full_name: Loo, Roger last_name: Loo citation: ama: Shimura Y, Godfrin C, Hikavyy A, et al. Compressively strained epitaxial Ge layers for quantum computing applications. Materials Science in Semiconductor Processing. 2024;174(5). doi:10.1016/j.mssp.2024.108231 apa: Shimura, Y., Godfrin, C., Hikavyy, A., Li, R., Aguilera Servin, J. L., Katsaros, G., … Loo, R. (2024). Compressively strained epitaxial Ge layers for quantum computing applications. Materials Science in Semiconductor Processing. Elsevier. https://doi.org/10.1016/j.mssp.2024.108231 chicago: Shimura, Yosuke, Clement Godfrin, Andriy Hikavyy, Roy Li, Juan L Aguilera Servin, Georgios Katsaros, Paola Favia, et al. “Compressively Strained Epitaxial Ge Layers for Quantum Computing Applications.” Materials Science in Semiconductor Processing. Elsevier, 2024. https://doi.org/10.1016/j.mssp.2024.108231. ieee: Y. Shimura et al., “Compressively strained epitaxial Ge layers for quantum computing applications,” Materials Science in Semiconductor Processing, vol. 174, no. 5. Elsevier, 2024. ista: Shimura Y, Godfrin C, Hikavyy A, Li R, Aguilera Servin JL, Katsaros G, Favia P, Han H, Wan D, de Greve K, Loo R. 2024. Compressively strained epitaxial Ge layers for quantum computing applications. Materials Science in Semiconductor Processing. 174(5), 108231. mla: Shimura, Yosuke, et al. “Compressively Strained Epitaxial Ge Layers for Quantum Computing Applications.” Materials Science in Semiconductor Processing, vol. 174, no. 5, 108231, Elsevier, 2024, doi:10.1016/j.mssp.2024.108231. short: Y. Shimura, C. Godfrin, A. Hikavyy, R. Li, J.L. Aguilera Servin, G. Katsaros, P. Favia, H. Han, D. Wan, K. de Greve, R. Loo, Materials Science in Semiconductor Processing 174 (2024). date_created: 2024-02-22T14:10:40Z date_published: 2024-02-20T00:00:00Z date_updated: 2024-02-26T10:36:35Z day: '20' ddc: - '530' department: - _id: GeKa - _id: NanoFab doi: 10.1016/j.mssp.2024.108231 has_accepted_license: '1' intvolume: ' 174' issue: '5' keyword: - Mechanical Engineering - Mechanics of Materials - Condensed Matter Physics - General Materials Science language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.1016/j.mssp.2024.108231 month: '02' oa: 1 oa_version: Published Version project: - _id: 34c0acea-11ca-11ed-8bc3-8775e10fd452 grant_number: '101069515' name: Integrated GermaNIum quanTum tEchnology publication: Materials Science in Semiconductor Processing publication_identifier: issn: - 1369-8001 publication_status: epub_ahead publisher: Elsevier quality_controlled: '1' status: public title: Compressively strained epitaxial Ge layers for quantum computing applications tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 174 year: '2024' ... --- _id: '13312' abstract: - lang: eng text: "Superconductor/semiconductor hybrid devices have attracted increasing\r\ninterest in the past years. Superconducting electronics aims to complement\r\nsemiconductor technology, while hybrid architectures are at the forefront of\r\nnew ideas such as topological superconductivity and protected qubits. In this\r\nwork, we engineer the induced superconductivity in two-dimensional germanium\r\nhole gas by varying the distance between the quantum well and the aluminum. We\r\ndemonstrate a hard superconducting gap and realize an electrically and flux\r\ntunable superconducting diode using a superconducting quantum interference\r\ndevice (SQUID). This allows to tune the current phase relation (CPR), to a\r\nregime where single Cooper pair tunneling is suppressed, creating a $ \\sin\r\n\\left( 2 \\varphi \\right)$ CPR. Shapiro experiments complement this\r\ninterpretation and the microwave drive allows to create a diode with $ \\approx\r\n100 \\%$ efficiency. The reported results open up the path towards monolithic\r\nintegration of spin qubit devices, microwave resonators and (protected)\r\nsuperconducting qubits on a silicon technology compatible platform." acknowledged_ssus: - _id: M-Shop - _id: NanoFab acknowledgement: "The authors acknowledge Alexander Brinkmann, Alessandro Crippa, Andrew Higginbotham, Andrea Iorio, Giordano\r\nScappucci and Christian Schonenberger for helpful discussions. We thank Marcel Verheijen for the support in the\r\nTEM analysis. This research and related results were made\r\npossible with the support of the NOMIS Foundation. It was\r\nsupported by the Scientific Service Units of ISTA through resources provided by the MIBA Machine Shop and the\r\nnanofabrication facility, the European Union’s Horizon 2020\r\nresearch and innovation programme under Grant Agreement\r\nNo 862046, the HORIZON-RIA 101069515 project and the\r\nFWF Projects #P-32235, #P-36507 and #F-8606. R.S.S.\r\nacknowledges Spanish CM “Talento Program” Project No.\r\n2022-T1/IND-24070." article_number: '2306.07109' article_processing_charge: No author: - first_name: Marco full_name: Valentini, Marco id: C0BB2FAC-D767-11E9-B658-BC13E6697425 last_name: Valentini - first_name: Oliver full_name: Sagi, Oliver id: 71616374-A8E9-11E9-A7CA-09ECE5697425 last_name: Sagi - first_name: Levon full_name: Baghumyan, Levon last_name: Baghumyan - first_name: Thijs de full_name: Gijsel, Thijs de last_name: Gijsel - first_name: Jason full_name: Jung, Jason id: 4C9ACE7A-F248-11E8-B48F-1D18A9856A87 last_name: Jung - first_name: Stefano full_name: Calcaterra, Stefano last_name: Calcaterra - first_name: Andrea full_name: Ballabio, Andrea last_name: Ballabio - first_name: Juan Aguilera full_name: Servin, Juan Aguilera last_name: Servin - first_name: Kushagra full_name: Aggarwal, Kushagra id: b22ab905-3539-11eb-84c3-fc159dcd79cb last_name: Aggarwal orcid: 0000-0001-9985-9293 - first_name: Marian full_name: Janik, Marian id: 396A1950-F248-11E8-B48F-1D18A9856A87 last_name: Janik - first_name: Thomas full_name: Adletzberger, Thomas id: 38756BB2-F248-11E8-B48F-1D18A9856A87 last_name: Adletzberger - first_name: Rubén Seoane full_name: Souto, Rubén Seoane last_name: Souto - first_name: Martin full_name: Leijnse, Martin last_name: Leijnse - first_name: Jeroen full_name: Danon, Jeroen last_name: Danon - first_name: Constantin full_name: Schrade, Constantin last_name: Schrade - first_name: Erik full_name: Bakkers, Erik last_name: Bakkers - first_name: Daniel full_name: Chrastina, Daniel last_name: Chrastina - first_name: Giovanni full_name: Isella, Giovanni last_name: Isella - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros orcid: 0000-0001-8342-202X citation: ama: Valentini M, Sagi O, Baghumyan L, et al. Radio frequency driven superconducting diode and parity conserving  Cooper pair transport in a two-dimensional germanium hole gas. arXiv. doi:10.48550/arXiv.2306.07109 apa: Valentini, M., Sagi, O., Baghumyan, L., Gijsel, T. de, Jung, J., Calcaterra, S., … Katsaros, G. (n.d.). Radio frequency driven superconducting diode and parity conserving  Cooper pair transport in a two-dimensional germanium hole gas. arXiv. https://doi.org/10.48550/arXiv.2306.07109 chicago: Valentini, Marco, Oliver Sagi, Levon Baghumyan, Thijs de Gijsel, Jason Jung, Stefano Calcaterra, Andrea Ballabio, et al. “Radio Frequency Driven Superconducting Diode and Parity Conserving  Cooper Pair Transport in a Two-Dimensional Germanium Hole Gas.” ArXiv, n.d. https://doi.org/10.48550/arXiv.2306.07109. ieee: M. Valentini et al., “Radio frequency driven superconducting diode and parity conserving  Cooper pair transport in a two-dimensional germanium hole gas,” arXiv. . ista: Valentini M, Sagi O, Baghumyan L, Gijsel T de, Jung J, Calcaterra S, Ballabio A, Servin JA, Aggarwal K, Janik M, Adletzberger T, Souto RS, Leijnse M, Danon J, Schrade C, Bakkers E, Chrastina D, Isella G, Katsaros G. Radio frequency driven superconducting diode and parity conserving  Cooper pair transport in a two-dimensional germanium hole gas. arXiv, 2306.07109. mla: Valentini, Marco, et al. “Radio Frequency Driven Superconducting Diode and Parity Conserving  Cooper Pair Transport in a Two-Dimensional Germanium Hole Gas.” ArXiv, 2306.07109, doi:10.48550/arXiv.2306.07109. short: M. Valentini, O. Sagi, L. Baghumyan, T. de Gijsel, J. Jung, S. Calcaterra, A. Ballabio, J.A. Servin, K. Aggarwal, M. Janik, T. Adletzberger, R.S. Souto, M. Leijnse, J. Danon, C. Schrade, E. Bakkers, D. Chrastina, G. Isella, G. Katsaros, ArXiv (n.d.). date_created: 2023-07-26T11:17:20Z date_published: 2023-06-13T00:00:00Z date_updated: 2024-02-07T07:52:32Z day: '13' ddc: - '530' department: - _id: GeKa - _id: M-Shop doi: 10.48550/arXiv.2306.07109 ec_funded: 1 external_id: arxiv: - '2306.07109' keyword: - Mesoscale and Nanoscale Physics language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2306.07109 month: '06' oa: 1 oa_version: Preprint project: - _id: 237E5020-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '862046' name: TOPOLOGICALLY PROTECTED AND SCALABLE QUANTUM BITS - _id: 237B3DA4-32DE-11EA-91FC-C7463DDC885E call_identifier: FWF grant_number: P32235 name: Towards scalable hut wire quantum devices - _id: bd8bd29e-d553-11ed-ba76-f0070d4b237a grant_number: P36507 name: Merging spin and superconducting qubits in planar Ge - _id: 34a66131-11ca-11ed-8bc3-a31681c6b03e grant_number: F8606 name: Conventional and unconventional topological superconductors - _id: bd5b4ec5-d553-11ed-ba76-a6eedb083344 name: Protected states of quantum matter publication: arXiv publication_status: submitted related_material: record: - id: '13286' relation: dissertation_contains status: public status: public title: Radio frequency driven superconducting diode and parity conserving Cooper pair transport in a two-dimensional germanium hole gas tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: preprint user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9 year: '2023' ... --- _id: '10920' abstract: - lang: eng text: The spin-orbit interaction permits to control the state of a spin qubit via electric fields. For holes it is particularly strong, allowing for fast all electrical qubit manipulation, and yet an in-depth understanding of this interaction in hole systems is missing. Here we investigate, experimentally and theoretically, the effect of the cubic Rashba spin-orbit interaction on the mixing of the spin states by studying singlet-triplet oscillations in a planar Ge hole double quantum dot. Landau-Zener sweeps at different magnetic field directions allow us to disentangle the effects of the spin-orbit induced spin-flip term from those caused by strongly site-dependent and anisotropic quantum dot g tensors. Our work, therefore, provides new insights into the hole spin-orbit interaction, necessary for optimizing future qubit experiments. acknowledged_ssus: - _id: M-Shop - _id: NanoFab acknowledgement: "This research was supported by the Scientific Service Units of ISTA through resources provided by the MIBA Machine Shop and the nanofabrication facility. This project has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie\r\nSkłodowska-Curie Grant Agreement No. 844511, No. 75441, and by the FWF-P 30207, I05060, and M3032-N projects. A. B. acknowledges support from the EU Horizon-2020 FET project microSPIRE, ID: 766955. P.M. M. and G. B. acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG—German Research Foundation) under Project No. 450396347. This work was supported by the Royal Society (URF\\R1\\191150) and the European Research Council (Grant Agreement No. 948932), N. A. acknowledges the use of the University of Oxford Advanced Research Computing (ARC) facility." article_number: '126803' article_processing_charge: No article_type: original author: - first_name: Daniel full_name: Jirovec, Daniel id: 4C473F58-F248-11E8-B48F-1D18A9856A87 last_name: Jirovec orcid: 0000-0002-7197-4801 - first_name: Philipp M. full_name: Mutter, Philipp M. last_name: Mutter - first_name: Andrea C full_name: Hofmann, Andrea C id: 340F461A-F248-11E8-B48F-1D18A9856A87 last_name: Hofmann - first_name: Alessandro full_name: Crippa, Alessandro id: 1F2B21A2-F6E7-11E9-9B82-F7DBE5697425 last_name: Crippa orcid: 0000-0002-2968-611X - first_name: Marek full_name: Rychetsky, Marek last_name: Rychetsky - first_name: David L. full_name: Craig, David L. last_name: Craig - first_name: Josip full_name: Kukucka, Josip id: 3F5D8856-F248-11E8-B48F-1D18A9856A87 last_name: Kukucka - first_name: Frederico full_name: Martins, Frederico id: 38F80F9A-1CB8-11EA-BC76-B49B3DDC885E last_name: Martins orcid: 0000-0003-2668-2401 - first_name: Andrea full_name: Ballabio, Andrea last_name: Ballabio - first_name: Natalia full_name: Ares, Natalia last_name: Ares - first_name: Daniel full_name: Chrastina, Daniel last_name: Chrastina - first_name: Giovanni full_name: Isella, Giovanni last_name: Isella - first_name: 'Guido ' full_name: 'Burkard, Guido ' last_name: Burkard - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros citation: ama: Jirovec D, Mutter PM, Hofmann AC, et al. Dynamics of hole singlet-triplet qubits with large g-factor differences. Physical Review Letters. 2022;128(12). doi:10.1103/PhysRevLett.128.126803 apa: Jirovec, D., Mutter, P. M., Hofmann, A. C., Crippa, A., Rychetsky, M., Craig, D. L., … Katsaros, G. (2022). Dynamics of hole singlet-triplet qubits with large g-factor differences. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.128.126803 chicago: Jirovec, Daniel, Philipp M. Mutter, Andrea C Hofmann, Alessandro Crippa, Marek Rychetsky, David L. Craig, Josip Kukucka, et al. “Dynamics of Hole Singlet-Triplet Qubits with Large g-Factor Differences.” Physical Review Letters. American Physical Society, 2022. https://doi.org/10.1103/PhysRevLett.128.126803. ieee: D. Jirovec et al., “Dynamics of hole singlet-triplet qubits with large g-factor differences,” Physical Review Letters, vol. 128, no. 12. American Physical Society, 2022. ista: Jirovec D, Mutter PM, Hofmann AC, Crippa A, Rychetsky M, Craig DL, Kukucka J, Martins F, Ballabio A, Ares N, Chrastina D, Isella G, Burkard G, Katsaros G. 2022. Dynamics of hole singlet-triplet qubits with large g-factor differences. Physical Review Letters. 128(12), 126803. mla: Jirovec, Daniel, et al. “Dynamics of Hole Singlet-Triplet Qubits with Large g-Factor Differences.” Physical Review Letters, vol. 128, no. 12, 126803, American Physical Society, 2022, doi:10.1103/PhysRevLett.128.126803. short: D. Jirovec, P.M. Mutter, A.C. Hofmann, A. Crippa, M. Rychetsky, D.L. Craig, J. Kukucka, F. Martins, A. Ballabio, N. Ares, D. Chrastina, G. Isella, G. Burkard, G. Katsaros, Physical Review Letters 128 (2022). date_created: 2022-03-24T15:51:11Z date_published: 2022-03-24T00:00:00Z date_updated: 2023-08-03T06:14:58Z day: '24' ddc: - '530' department: - _id: GradSch - _id: GeKa doi: 10.1103/PhysRevLett.128.126803 ec_funded: 1 external_id: arxiv: - '2111.05130' isi: - '000786542500004' file: - access_level: open_access checksum: 6e66ad548d18db9c131f304acbd5a1f4 content_type: application/pdf creator: dernst date_created: 2022-03-28T06:53:39Z date_updated: 2022-03-28T06:53:39Z file_id: '10928' file_name: 2022_PhysRevLetters_Jirovec.pdf file_size: 1266515 relation: main_file success: 1 file_date_updated: 2022-03-28T06:53:39Z has_accepted_license: '1' intvolume: ' 128' isi: 1 issue: '12' language: - iso: eng month: '03' oa: 1 oa_version: Published Version project: - _id: 26A151DA-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '844511' name: Majorana bound states in Ge/SiGe heterostructures - _id: 260C2330-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '754411' name: ISTplus - Postdoctoral Fellowships - _id: 2641CE5E-B435-11E9-9278-68D0E5697425 call_identifier: FWF grant_number: P30207 name: Hole spin orbit qubits in Ge quantum wells - _id: c0977eea-5a5b-11eb-8a69-a862db0cf4d1 grant_number: I05060 name: High impedance circuit quantum electrodynamics with hole spins - _id: c08c05c4-5a5b-11eb-8a69-dc6ce49d7973 grant_number: M03032 name: Long-range spin exchange for 2D qubits architectures publication: Physical Review Letters publication_identifier: eissn: - 1079-7114 publication_status: published publisher: American Physical Society quality_controlled: '1' status: public title: Dynamics of hole singlet-triplet qubits with large g-factor differences tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 128 year: '2022' ... --- _id: '12118' abstract: - lang: eng text: Hybrid semiconductor–superconductor devices hold great promise for realizing topological quantum computing with Majorana zero modes1,2,3,4,5. However, multiple claims of Majorana detection, based on either tunnelling6,7,8,9,10 or Coulomb blockade (CB) spectroscopy11,12, remain disputed. Here we devise an experimental protocol that allows us to perform both types of measurement on the same hybrid island by adjusting its charging energy via tunable junctions to the normal leads. This method reduces ambiguities of Majorana detections by checking the consistency between CB spectroscopy and zero-bias peaks in non-blockaded transport. Specifically, we observe junction-dependent, even–odd modulated, single-electron CB peaks in InAs/Al hybrid nanowires without concomitant low-bias peaks in tunnelling spectroscopy. We provide a theoretical interpretation of the experimental observations in terms of low-energy, longitudinally confined island states rather than overlapping Majorana modes. Our results highlight the importance of combined measurements on the same device for the identification of topological Majorana zero modes. acknowledged_ssus: - _id: M-Shop - _id: NanoFab acknowledgement: We thank P. Krogstrup for providing us with the NW materials. We thank A. Higginbotham, E. J. H. Lee, C. Marcus and S. Vaitiekėnas for helpful discussions and G. Steffensen for his input on the diffusive Little-Parks theory. This research was supported by the Scientific Service Units of ISTA through resources provided by the MIBA Machine Shop and the nanofabrication facility; the NOMIS Foundation; the CSIC Interdisciplinary Thematic Platform (PTI+) on Quantum Technologies (PTI-QTEP+). A.H. acknowledges support from H2020-MSCA-IF-2018/844511. ICN2 also acknowledges funding from Generalitat de Catalunya 2017 SGR 327. ICN2 is supported by the Severo Ochoa Program from Spanish MINECO (Grant no. SEV-2017-0706) and is funded by the CERCA Programme/Generalitat de Catalunya. Part of the present work has been performed in the framework of Universitat Autònoma de Barcelona Materials Science PhD programme. Authors acknowledge the use of instrumentation as well as the technical advice provided by the National Facility ELECMI ICTS, node ‘Laboratorio de Microscopías Avanzadas’ at University of Zaragoza. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 823717-ESTEEM3. This study was supported by MCIN with funding from European Union NextGenerationEU (PRTR-C17.I1) and Generalitat de Catalunya. This research is part of the CSIC programme for the Spanish Recovery, Transformation and Resilience Plan funded by the Recovery and Resilience Facility of the European Union, established by the Regulation (EU) 2020/2094. We thank support from Grant PGC2018-097018-BI00, project FlagERA TOPOGRAPH (PCI2018-093026) and project NANOGEN (PID2020-116093RB-C43), funded by MCIN/AEI/10.13039/501100011033/ and by ‘ERDF A way of making Europe’, by the European Union. M. Botifoll acknowledges support from SUR Generalitat de Catalunya and the EU Social Fund (project ref. 2020 FI 00103). article_processing_charge: No article_type: original author: - first_name: Marco full_name: Valentini, Marco id: C0BB2FAC-D767-11E9-B658-BC13E6697425 last_name: Valentini - first_name: Maksim full_name: Borovkov, Maksim id: 2ac7a0a2-3562-11eb-9256-fbd18ea55087 last_name: Borovkov - first_name: Elsa full_name: Prada, Elsa last_name: Prada - first_name: Sara full_name: Martí-Sánchez, Sara last_name: Martí-Sánchez - first_name: Marc full_name: Botifoll, Marc last_name: Botifoll - first_name: Andrea C full_name: Hofmann, Andrea C id: 340F461A-F248-11E8-B48F-1D18A9856A87 last_name: Hofmann - first_name: Jordi full_name: Arbiol, Jordi last_name: Arbiol - first_name: Ramón full_name: Aguado, Ramón last_name: Aguado - first_name: Pablo full_name: San-Jose, Pablo last_name: San-Jose - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros orcid: 0000-0001-8342-202X citation: ama: Valentini M, Borovkov M, Prada E, et al. Majorana-like Coulomb spectroscopy in the absence of zero-bias peaks. Nature. 2022;612(7940):442-447. doi:10.1038/s41586-022-05382-w apa: Valentini, M., Borovkov, M., Prada, E., Martí-Sánchez, S., Botifoll, M., Hofmann, A. C., … Katsaros, G. (2022). Majorana-like Coulomb spectroscopy in the absence of zero-bias peaks. Nature. Springer Nature. https://doi.org/10.1038/s41586-022-05382-w chicago: Valentini, Marco, Maksim Borovkov, Elsa Prada, Sara Martí-Sánchez, Marc Botifoll, Andrea C Hofmann, Jordi Arbiol, Ramón Aguado, Pablo San-Jose, and Georgios Katsaros. “Majorana-like Coulomb Spectroscopy in the Absence of Zero-Bias Peaks.” Nature. Springer Nature, 2022. https://doi.org/10.1038/s41586-022-05382-w. ieee: M. Valentini et al., “Majorana-like Coulomb spectroscopy in the absence of zero-bias peaks,” Nature, vol. 612, no. 7940. Springer Nature, pp. 442–447, 2022. ista: Valentini M, Borovkov M, Prada E, Martí-Sánchez S, Botifoll M, Hofmann AC, Arbiol J, Aguado R, San-Jose P, Katsaros G. 2022. Majorana-like Coulomb spectroscopy in the absence of zero-bias peaks. Nature. 612(7940), 442–447. mla: Valentini, Marco, et al. “Majorana-like Coulomb Spectroscopy in the Absence of Zero-Bias Peaks.” Nature, vol. 612, no. 7940, Springer Nature, 2022, pp. 442–47, doi:10.1038/s41586-022-05382-w. short: M. Valentini, M. Borovkov, E. Prada, S. Martí-Sánchez, M. Botifoll, A.C. Hofmann, J. Arbiol, R. Aguado, P. San-Jose, G. Katsaros, Nature 612 (2022) 442–447. date_created: 2023-01-12T11:56:45Z date_published: 2022-12-15T00:00:00Z date_updated: 2024-02-21T12:35:33Z day: '15' department: - _id: GeKa doi: 10.1038/s41586-022-05382-w ec_funded: 1 external_id: arxiv: - '2203.07829' isi: - '000899725400001' intvolume: ' 612' isi: 1 issue: '7940' keyword: - Multidisciplinary language: - iso: eng main_file_link: - open_access: '1' url: ' https://doi.org/10.48550/arXiv.2203.07829' month: '12' oa: 1 oa_version: Preprint page: 442-447 project: - _id: 26A151DA-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '844511' name: Majorana bound states in Ge/SiGe heterostructures publication: Nature publication_identifier: eissn: - 1476-4687 issn: - 0028-0836 publication_status: published publisher: Springer Nature quality_controlled: '1' related_material: link: - description: News on ISTA Website relation: press_release url: https://ista.ac.at/en/news/imposter-particles-revealed-and-explained/ record: - id: '13286' relation: dissertation_contains status: public - id: '12522' relation: research_data status: public scopus_import: '1' status: public title: Majorana-like Coulomb spectroscopy in the absence of zero-bias peaks type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 612 year: '2022' ... --- _id: '9464' abstract: - lang: eng text: We firstly introduce the self-assembled growth of highly uniform Ge quantum wires with controllable position, distance and length on patterned Si (001) substrates. We then present the electrically tunable strong spin-orbit coupling, the first Ge hole spin qubit and ultrafast operation of hole spin qubit in the Ge/Si quantum wires. acknowledgement: This work was supported by the National Key R&D Program of China (Grant No. 2016YFA0301700) and the ERC Starting Grant no. 335497. article_number: '9420817' article_processing_charge: No author: - first_name: Fei full_name: Gao, Fei last_name: Gao - first_name: Jie Yin full_name: Zhang, Jie Yin last_name: Zhang - first_name: Jian Huan full_name: Wang, Jian Huan last_name: Wang - first_name: Ming full_name: Ming, Ming last_name: Ming - first_name: Tina full_name: Wang, Tina last_name: Wang - first_name: Jian Jun full_name: Zhang, Jian Jun last_name: Zhang - first_name: Hannes full_name: Watzinger, Hannes id: 35DF8E50-F248-11E8-B48F-1D18A9856A87 last_name: Watzinger - first_name: Josip full_name: Kukucka, Josip id: 3F5D8856-F248-11E8-B48F-1D18A9856A87 last_name: Kukucka - first_name: Lada full_name: Vukušić, Lada id: 31E9F056-F248-11E8-B48F-1D18A9856A87 last_name: Vukušić orcid: 0000-0003-2424-8636 - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros orcid: 0000-0001-8342-202X - first_name: Ke full_name: Wang, Ke last_name: Wang - first_name: Gang full_name: Xu, Gang last_name: Xu - first_name: Hai Ou full_name: Li, Hai Ou last_name: Li - first_name: Guo Ping full_name: Guo, Guo Ping last_name: Guo citation: ama: 'Gao F, Zhang JY, Wang JH, et al. Ge/Si quantum wires for quantum computing. In: 2021 5th IEEE Electron Devices Technology and Manufacturing Conference, EDTM 2021. IEEE; 2021. doi:10.1109/EDTM50988.2021.9420817' apa: 'Gao, F., Zhang, J. Y., Wang, J. H., Ming, M., Wang, T., Zhang, J. J., … Guo, G. P. (2021). Ge/Si quantum wires for quantum computing. In 2021 5th IEEE Electron Devices Technology and Manufacturing Conference, EDTM 2021. Virtual, Online: IEEE. https://doi.org/10.1109/EDTM50988.2021.9420817' chicago: Gao, Fei, Jie Yin Zhang, Jian Huan Wang, Ming Ming, Tina Wang, Jian Jun Zhang, Hannes Watzinger, et al. “Ge/Si Quantum Wires for Quantum Computing.” In 2021 5th IEEE Electron Devices Technology and Manufacturing Conference, EDTM 2021. IEEE, 2021. https://doi.org/10.1109/EDTM50988.2021.9420817. ieee: F. Gao et al., “Ge/Si quantum wires for quantum computing,” in 2021 5th IEEE Electron Devices Technology and Manufacturing Conference, EDTM 2021, Virtual, Online, 2021. ista: 'Gao F, Zhang JY, Wang JH, Ming M, Wang T, Zhang JJ, Watzinger H, Kukucka J, Vukušić L, Katsaros G, Wang K, Xu G, Li HO, Guo GP. 2021. Ge/Si quantum wires for quantum computing. 2021 5th IEEE Electron Devices Technology and Manufacturing Conference, EDTM 2021. EDTM: IEEE Electron Devices Technology and Manufacturing Conference, 9420817.' mla: Gao, Fei, et al. “Ge/Si Quantum Wires for Quantum Computing.” 2021 5th IEEE Electron Devices Technology and Manufacturing Conference, EDTM 2021, 9420817, IEEE, 2021, doi:10.1109/EDTM50988.2021.9420817. short: F. Gao, J.Y. Zhang, J.H. Wang, M. Ming, T. Wang, J.J. Zhang, H. Watzinger, J. Kukucka, L. Vukušić, G. Katsaros, K. Wang, G. Xu, H.O. Li, G.P. Guo, in:, 2021 5th IEEE Electron Devices Technology and Manufacturing Conference, EDTM 2021, IEEE, 2021. conference: end_date: 2021-04-11 location: Virtual, Online name: 'EDTM: IEEE Electron Devices Technology and Manufacturing Conference' start_date: 2021-04-08 date_created: 2021-06-06T22:01:29Z date_published: 2021-04-08T00:00:00Z date_updated: 2023-10-03T12:51:59Z day: '08' department: - _id: GeKa doi: 10.1109/EDTM50988.2021.9420817 ec_funded: 1 external_id: isi: - '000675595800006' isi: 1 language: - iso: eng month: '04' oa_version: None project: - _id: 25517E86-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '335497' name: Towards Spin qubits and Majorana fermions in Germanium selfassembled hut-wires publication: 2021 5th IEEE Electron Devices Technology and Manufacturing Conference, EDTM 2021 publication_identifier: isbn: - '9781728181769' publication_status: published publisher: IEEE quality_controlled: '1' scopus_import: '1' status: public title: Ge/Si quantum wires for quantum computing type: conference user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2021' ... --- _id: '9291' abstract: - lang: eng text: "This .zip File contains the transport data for figures presented in the main text and supplementary material of \"Enhancement of Proximity Induced Superconductivity in Planar Germanium\" by K. Aggarwal, et. al. \r\nThe measurements were done using Labber Software and the data is stored in the hdf5 file format. The files can be opened using either the Labber Log Browser (https://labber.org/overview/) or Labber Python API (http://labber.org/online-doc/api/LogFile.html)." article_processing_charge: No author: - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros orcid: 0000-0001-8342-202X citation: ama: 'Katsaros G. Raw transport data for: Enhancement of proximity induced superconductivity in planar germanium. 2021. doi:10.15479/AT:ISTA:9291' apa: 'Katsaros, G. (2021). Raw transport data for: Enhancement of proximity induced superconductivity in planar germanium. Institute of Science and Technology Austria. https://doi.org/10.15479/AT:ISTA:9291' chicago: 'Katsaros, Georgios. “Raw Transport Data for: Enhancement of Proximity Induced Superconductivity in Planar Germanium.” Institute of Science and Technology Austria, 2021. https://doi.org/10.15479/AT:ISTA:9291.' ieee: 'G. Katsaros, “Raw transport data for: Enhancement of proximity induced superconductivity in planar germanium.” Institute of Science and Technology Austria, 2021.' ista: 'Katsaros G. 2021. Raw transport data for: Enhancement of proximity induced superconductivity in planar germanium, Institute of Science and Technology Austria, 10.15479/AT:ISTA:9291.' mla: 'Katsaros, Georgios. Raw Transport Data for: Enhancement of Proximity Induced Superconductivity in Planar Germanium. Institute of Science and Technology Austria, 2021, doi:10.15479/AT:ISTA:9291.' short: G. Katsaros, (2021). date_created: 2021-03-27T13:47:49Z date_published: 2021-03-29T00:00:00Z date_updated: 2024-02-21T12:37:14Z day: '29' ddc: - '530' department: - _id: GeKa doi: 10.15479/AT:ISTA:9291 file: - access_level: open_access checksum: 635df3c08fc13c3dac008cd421aefbe4 content_type: application/x-zip-compressed creator: gkatsaro date_created: 2021-03-27T13:46:17Z date_updated: 2021-03-27T13:46:17Z file_id: '9292' file_name: Raw Data- Enhancement of Superconductivity in a Planar Ge hole gas.zip file_size: 10616071 relation: main_file success: 1 - access_level: open_access checksum: 12b3ca69ae7509a346711baae0b02a75 content_type: text/plain creator: dernst date_created: 2021-04-01T07:52:56Z date_updated: 2021-04-01T07:52:56Z file_id: '9302' file_name: README.txt file_size: 470 relation: main_file success: 1 file_date_updated: 2021-04-01T07:52:56Z has_accepted_license: '1' month: '03' oa: 1 oa_version: Published Version publisher: Institute of Science and Technology Austria status: public title: 'Raw transport data for: Enhancement of proximity induced superconductivity in planar germanium' tmp: image: /images/cc_0.png legal_code_url: https://creativecommons.org/publicdomain/zero/1.0/legalcode name: Creative Commons Public Domain Dedication (CC0 1.0) short: CC0 (1.0) type: research_data user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2021' ... --- _id: '8910' abstract: - lang: eng text: A semiconducting nanowire fully wrapped by a superconducting shell has been proposed as a platform for obtaining Majorana modes at small magnetic fields. In this study, we demonstrate that the appearance of subgap states in such structures is actually governed by the junction region in tunneling spectroscopy measurements and not the full-shell nanowire itself. Short tunneling regions never show subgap states, whereas longer junctions always do. This can be understood in terms of quantum dots forming in the junction and hosting Andreev levels in the Yu-Shiba-Rusinov regime. The intricate magnetic field dependence of the Andreev levels, through both the Zeeman and Little-Parks effects, may result in robust zero-bias peaks—features that could be easily misinterpreted as originating from Majorana zero modes but are unrelated to topological superconductivity. acknowledged_ssus: - _id: M-Shop - _id: NanoFab acknowledgement: The authors thank A. Higginbotham, E. J. H. Lee and F. R. Martins for helpful discussions. This research was supported by the Scientific Service Units of IST Austria through resources provided by the MIBA Machine Shop and the nanofabrication facility; the NOMIS Foundation and Microsoft; the European Union’s Horizon 2020 research and innovation program under the Marie SklodowskaCurie grant agreement No 844511; the FETOPEN Grant Agreement No. 828948; the European Research Commission through the grant agreement HEMs-DAM No 716655; the Spanish Ministry of Science and Innovation through Grants PGC2018-097018-B-I00, PCI2018-093026, FIS2016-80434-P (AEI/FEDER, EU), RYC2011-09345 (Ram´on y Cajal Programme), and the Mar´ıa de Maeztu Programme for Units of Excellence in R&D (CEX2018-000805-M); the CSIC Research Platform on Quantum Technologies PTI-001. article_number: 82-88 article_processing_charge: No article_type: original author: - first_name: Marco full_name: Valentini, Marco id: C0BB2FAC-D767-11E9-B658-BC13E6697425 last_name: Valentini - first_name: Fernando full_name: Peñaranda, Fernando last_name: Peñaranda - first_name: Andrea C full_name: Hofmann, Andrea C id: 340F461A-F248-11E8-B48F-1D18A9856A87 last_name: Hofmann - first_name: Matthias full_name: Brauns, Matthias id: 33F94E3C-F248-11E8-B48F-1D18A9856A87 last_name: Brauns - first_name: Robert full_name: Hauschild, Robert id: 4E01D6B4-F248-11E8-B48F-1D18A9856A87 last_name: Hauschild orcid: 0000-0001-9843-3522 - first_name: Peter full_name: Krogstrup, Peter last_name: Krogstrup - first_name: Pablo full_name: San-Jose, Pablo last_name: San-Jose - first_name: Elsa full_name: Prada, Elsa last_name: Prada - first_name: Ramón full_name: Aguado, Ramón last_name: Aguado - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros orcid: 0000-0001-8342-202X citation: ama: Valentini M, Peñaranda F, Hofmann AC, et al. Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable Andreev states. Science. 2021;373(6550). doi:10.1126/science.abf1513 apa: Valentini, M., Peñaranda, F., Hofmann, A. C., Brauns, M., Hauschild, R., Krogstrup, P., … Katsaros, G. (2021). Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable Andreev states. Science. American Association for the Advancement of Science. https://doi.org/10.1126/science.abf1513 chicago: Valentini, Marco, Fernando Peñaranda, Andrea C Hofmann, Matthias Brauns, Robert Hauschild, Peter Krogstrup, Pablo San-Jose, Elsa Prada, Ramón Aguado, and Georgios Katsaros. “Nontopological Zero-Bias Peaks in Full-Shell Nanowires Induced by Flux-Tunable Andreev States.” Science. American Association for the Advancement of Science, 2021. https://doi.org/10.1126/science.abf1513. ieee: M. Valentini et al., “Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable Andreev states,” Science, vol. 373, no. 6550. American Association for the Advancement of Science, 2021. ista: Valentini M, Peñaranda F, Hofmann AC, Brauns M, Hauschild R, Krogstrup P, San-Jose P, Prada E, Aguado R, Katsaros G. 2021. Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable Andreev states. Science. 373(6550), 82–88. mla: Valentini, Marco, et al. “Nontopological Zero-Bias Peaks in Full-Shell Nanowires Induced by Flux-Tunable Andreev States.” Science, vol. 373, no. 6550, 82–88, American Association for the Advancement of Science, 2021, doi:10.1126/science.abf1513. short: M. Valentini, F. Peñaranda, A.C. Hofmann, M. Brauns, R. Hauschild, P. Krogstrup, P. San-Jose, E. Prada, R. Aguado, G. Katsaros, Science 373 (2021). date_created: 2020-12-02T10:51:52Z date_published: 2021-07-02T00:00:00Z date_updated: 2024-02-21T12:40:09Z day: '02' department: - _id: GeKa - _id: Bio doi: 10.1126/science.abf1513 ec_funded: 1 external_id: arxiv: - '2008.02348' isi: - '000677843100034' intvolume: ' 373' isi: 1 issue: '6550' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2008.02348 month: '07' oa: 1 oa_version: Submitted Version project: - _id: 262116AA-B435-11E9-9278-68D0E5697425 name: Hybrid Semiconductor - Superconductor Quantum Devices - _id: 26A151DA-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '844511' name: Majorana bound states in Ge/SiGe heterostructures publication: Science publication_identifier: eissn: - '10959203' issn: - '00368075' publication_status: published publisher: American Association for the Advancement of Science quality_controlled: '1' related_material: link: - description: News on IST Homepage relation: press_release url: https://ist.ac.at/en/news/unfinding-a-split-electron/ record: - id: '13286' relation: dissertation_contains status: public - id: '9389' relation: research_data status: public scopus_import: '1' status: public title: Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable Andreev states type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 373 year: '2021' ... --- _id: '10559' abstract: - lang: eng text: Hole gases in planar germanium can have high mobilities in combination with strong spin-orbit interaction and electrically tunable g factors, and are therefore emerging as a promising platform for creating hybrid superconductor-semiconductor devices. A key challenge towards hybrid Ge-based quantum technologies is the design of high-quality interfaces and superconducting contacts that are robust against magnetic fields. In this work, by combining the assets of aluminum, which provides good contact to the Ge, and niobium, which has a significant superconducting gap, we demonstrate highly transparent low-disordered JoFETs with relatively large ICRN products that are capable of withstanding high magnetic fields. We furthermore demonstrate the ability of phase-biasing individual JoFETs, opening up an avenue to explore topological superconductivity in planar Ge. The persistence of superconductivity in the reported hybrid devices beyond 1.8 T paves the way towards integrating spin qubits and proximity-induced superconductivity on the same chip. acknowledged_ssus: - _id: NanoFab - _id: M-Shop acknowledgement: This research and related results were made possible with the support of the NOMIS Foundation. This research was supported by the Scientific Service Units of IST Austria through resources provided by the MIBA Machine Shop and the nanofabrication facility, the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant agreement No. 844511 Grant Agreement No. 862046. ICN2 acknowledge funding from Generalitat de Catalunya 2017 SGR 327. ICN2 is supported by the Severo Ochoa program from Spanish MINECO (Grant No. SEV-2017-0706) and is funded by the CERCA Programme/Generalitat de Catalunya. Part of the present work has been performed in the framework of Universitat Autnoma de Barcelona Materials Science PhD program. The HAADF-STEM microscopy was conducted in the Laboratorio de Microscopias Avanzadas at Instituto de Nanociencia de Aragon-Universidad de Zaragoza. Authors acknowledge the LMA-INA for offering access to their instruments and expertise. We acknowledge support from CSIC Research Platform on Quantum Technologies PTI-001. This project has received funding from the European Union's Horizon 2020 research and innovation programme under Grant Agreement No. 823717 ESTEEM3. M.B. acknowledges support from SUR Generalitat de Catalunya and the EU Social Fund; project ref. 2020 FI 00103. G.S. and M.V. acknowledge support through a projectruimte grant associated with the Netherlands Organization of Scientific Research (NWO). J.D. acknowledges support through FRIPRO-project 274853, which is funded by the Research Council of Norway. article_number: L022005 article_processing_charge: No article_type: original author: - first_name: Kushagra full_name: Aggarwal, Kushagra id: b22ab905-3539-11eb-84c3-fc159dcd79cb last_name: Aggarwal orcid: 0000-0001-9985-9293 - first_name: Andrea C full_name: Hofmann, Andrea C id: 340F461A-F248-11E8-B48F-1D18A9856A87 last_name: Hofmann - first_name: Daniel full_name: Jirovec, Daniel id: 4C473F58-F248-11E8-B48F-1D18A9856A87 last_name: Jirovec orcid: 0000-0002-7197-4801 - first_name: Ivan full_name: Prieto Gonzalez, Ivan id: 2A307FE2-F248-11E8-B48F-1D18A9856A87 last_name: Prieto Gonzalez orcid: 0000-0002-7370-5357 - first_name: Amir full_name: Sammak, Amir last_name: Sammak - first_name: Marc full_name: Botifoll, Marc last_name: Botifoll - first_name: Sara full_name: Martí-Sánchez, Sara last_name: Martí-Sánchez - first_name: Menno full_name: Veldhorst, Menno last_name: Veldhorst - first_name: Jordi full_name: Arbiol, Jordi last_name: Arbiol - first_name: Giordano full_name: Scappucci, Giordano last_name: Scappucci - first_name: Jeroen full_name: Danon, Jeroen last_name: Danon - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros orcid: 0000-0001-8342-202X citation: ama: Aggarwal K, Hofmann AC, Jirovec D, et al. Enhancement of proximity-induced superconductivity in a planar Ge hole gas. Physical Review Research. 2021;3(2). doi:10.1103/physrevresearch.3.l022005 apa: Aggarwal, K., Hofmann, A. C., Jirovec, D., Prieto Gonzalez, I., Sammak, A., Botifoll, M., … Katsaros, G. (2021). Enhancement of proximity-induced superconductivity in a planar Ge hole gas. Physical Review Research. American Physical Society. https://doi.org/10.1103/physrevresearch.3.l022005 chicago: Aggarwal, Kushagra, Andrea C Hofmann, Daniel Jirovec, Ivan Prieto Gonzalez, Amir Sammak, Marc Botifoll, Sara Martí-Sánchez, et al. “Enhancement of Proximity-Induced Superconductivity in a Planar Ge Hole Gas.” Physical Review Research. American Physical Society, 2021. https://doi.org/10.1103/physrevresearch.3.l022005. ieee: K. Aggarwal et al., “Enhancement of proximity-induced superconductivity in a planar Ge hole gas,” Physical Review Research, vol. 3, no. 2. American Physical Society, 2021. ista: Aggarwal K, Hofmann AC, Jirovec D, Prieto Gonzalez I, Sammak A, Botifoll M, Martí-Sánchez S, Veldhorst M, Arbiol J, Scappucci G, Danon J, Katsaros G. 2021. Enhancement of proximity-induced superconductivity in a planar Ge hole gas. Physical Review Research. 3(2), L022005. mla: Aggarwal, Kushagra, et al. “Enhancement of Proximity-Induced Superconductivity in a Planar Ge Hole Gas.” Physical Review Research, vol. 3, no. 2, L022005, American Physical Society, 2021, doi:10.1103/physrevresearch.3.l022005. short: K. Aggarwal, A.C. Hofmann, D. Jirovec, I. Prieto Gonzalez, A. Sammak, M. Botifoll, S. Martí-Sánchez, M. Veldhorst, J. Arbiol, G. Scappucci, J. Danon, G. Katsaros, Physical Review Research 3 (2021). date_created: 2021-12-16T18:50:57Z date_published: 2021-04-15T00:00:00Z date_updated: 2024-02-21T12:41:26Z day: '15' ddc: - '620' department: - _id: GeKa doi: 10.1103/physrevresearch.3.l022005 ec_funded: 1 external_id: arxiv: - '2012.00322' file: - access_level: open_access checksum: 60a1bc9c9b616b1b155044bb8cfc6484 content_type: application/pdf creator: cchlebak date_created: 2021-12-17T08:12:37Z date_updated: 2021-12-17T08:12:37Z file_id: '10561' file_name: 2021_PhysRevResearch_Aggarwal.pdf file_size: 1917512 relation: main_file success: 1 file_date_updated: 2021-12-17T08:12:37Z has_accepted_license: '1' intvolume: ' 3' issue: '2' keyword: - general engineering language: - iso: eng month: '04' oa: 1 oa_version: Published Version project: - _id: 26A151DA-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '844511' name: Majorana bound states in Ge/SiGe heterostructures - _id: 237E5020-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '862046' name: TOPOLOGICALLY PROTECTED AND SCALABLE QUANTUM BITS publication: Physical Review Research publication_identifier: issn: - 2643-1564 publication_status: published publisher: American Physical Society quality_controlled: '1' related_material: record: - id: '8831' relation: earlier_version status: public - id: '8834' relation: research_data status: public scopus_import: '1' status: public title: Enhancement of proximity-induced superconductivity in a planar Ge hole gas tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9 volume: 3 year: '2021' ... --- _id: '8911' abstract: - lang: eng text: "In the worldwide endeavor for disruptive quantum technologies, germanium is emerging as a versatile material to realize devices capable of encoding, processing, or transmitting quantum information. These devices leverage special properties of the germanium valence-band states, commonly known as holes, such as their inherently strong spin-orbit coupling and the ability to host superconducting pairing correlations. In this Review, we initially introduce the physics of holes in low-dimensional germanium structures with key insights from a theoretical perspective. We then examine the material science progress underpinning germanium-based planar heterostructures and nanowires. We review the most significant experimental results demonstrating key building blocks for quantum technology, such as an electrically driven universal quantum gate set with spin qubits in quantum dots and superconductor-semiconductor devices for hybrid quantum systems. We conclude by identifying the most promising prospects\r\ntoward scalable quantum information processing. " acknowledgement: "G.S., M.W.,F.A.Z acknowledge financial support from The Netherlands Organization for Scientific Research (NWO). F.Z., D.L., G.K. acknowledge funding from the European Union’s Horizon 2020 research and innovation programme under Grand Agreement Nr. 862046. G.K. acknowledges funding from FP7 ERC Starting Grant 335497, FWF Y 715-N30, FWF P-30207. S.D. acknowledges support from the European Union’s Horizon 2020 program under Grant\r\nAgreement No. 81050 and from the Agence Nationale de la Recherche through the TOPONANO and CMOSQSPIN projects. J.Z. acknowledges support from the National Key R&D Program of China (Grant No. 2016YFA0301701) and Strategic Priority Research Program of CAS (Grant No. XDB30000000). D.L. and C.K. acknowledge the Swiss National Science Foundation and NCCR QSIT." article_processing_charge: No article_type: original author: - first_name: Giordano full_name: Scappucci, Giordano last_name: Scappucci - first_name: Christoph full_name: Kloeffel, Christoph last_name: Kloeffel - first_name: Floris A. full_name: Zwanenburg, Floris A. last_name: Zwanenburg - first_name: Daniel full_name: Loss, Daniel last_name: Loss - first_name: Maksym full_name: Myronov, Maksym last_name: Myronov - first_name: Jian-Jun full_name: Zhang, Jian-Jun last_name: Zhang - first_name: Silvano De full_name: Franceschi, Silvano De last_name: Franceschi - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros orcid: 0000-0001-8342-202X - first_name: Menno full_name: Veldhorst, Menno last_name: Veldhorst citation: ama: Scappucci G, Kloeffel C, Zwanenburg FA, et al. The germanium quantum information route. Nature Reviews Materials. 2021;6:926–943. doi:10.1038/s41578-020-00262-z apa: Scappucci, G., Kloeffel, C., Zwanenburg, F. A., Loss, D., Myronov, M., Zhang, J.-J., … Veldhorst, M. (2021). The germanium quantum information route. Nature Reviews Materials. Springer Nature. https://doi.org/10.1038/s41578-020-00262-z chicago: Scappucci, Giordano, Christoph Kloeffel, Floris A. Zwanenburg, Daniel Loss, Maksym Myronov, Jian-Jun Zhang, Silvano De Franceschi, Georgios Katsaros, and Menno Veldhorst. “The Germanium Quantum Information Route.” Nature Reviews Materials. Springer Nature, 2021. https://doi.org/10.1038/s41578-020-00262-z. ieee: G. Scappucci et al., “The germanium quantum information route,” Nature Reviews Materials, vol. 6. Springer Nature, pp. 926–943, 2021. ista: Scappucci G, Kloeffel C, Zwanenburg FA, Loss D, Myronov M, Zhang J-J, Franceschi SD, Katsaros G, Veldhorst M. 2021. The germanium quantum information route. Nature Reviews Materials. 6, 926–943. mla: Scappucci, Giordano, et al. “The Germanium Quantum Information Route.” Nature Reviews Materials, vol. 6, Springer Nature, 2021, pp. 926–943, doi:10.1038/s41578-020-00262-z. short: G. Scappucci, C. Kloeffel, F.A. Zwanenburg, D. Loss, M. Myronov, J.-J. Zhang, S.D. Franceschi, G. Katsaros, M. Veldhorst, Nature Reviews Materials 6 (2021) 926–943. date_created: 2020-12-02T10:52:51Z date_published: 2021-10-01T00:00:00Z date_updated: 2024-03-07T14:48:57Z day: '01' department: - _id: GeKa doi: 10.1038/s41578-020-00262-z ec_funded: 1 external_id: arxiv: - '2004.08133' isi: - '000600826100003' intvolume: ' 6' isi: 1 language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2004.08133 month: '10' oa: 1 oa_version: Preprint page: '926–943 ' project: - _id: 25517E86-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '335497' name: Towards Spin qubits and Majorana fermions in Germanium selfassembled hut-wires - _id: 2552F888-B435-11E9-9278-68D0E5697425 call_identifier: FWF grant_number: Y00715 name: Loch Spin-Qubits und Majorana-Fermionen in Germanium - _id: 2641CE5E-B435-11E9-9278-68D0E5697425 call_identifier: FWF grant_number: P30207 name: Hole spin orbit qubits in Ge quantum wells publication: Nature Reviews Materials publication_identifier: eissn: - 2058-8437 publication_status: published publisher: Springer Nature quality_controlled: '1' scopus_import: '1' status: public title: The germanium quantum information route type: journal_article user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87 volume: 6 year: '2021' ... --- _id: '8909' abstract: - lang: eng text: Spin qubits are considered to be among the most promising candidates for building a quantum processor. Group IV hole spin qubits have moved into the focus of interest due to the ease of operation and compatibility with Si technology. In addition, Ge offers the option for monolithic superconductor-semiconductor integration. Here we demonstrate a hole spin qubit operating at fields below 10 mT, the critical field of Al, by exploiting the large out-of-plane hole g-factors in planar Ge and by encoding the qubit into the singlet-triplet states of a double quantum dot. We observe electrically controlled X and Z-rotations with tunable frequencies exceeding 100 MHz and dephasing times of 1μs which we extend beyond 15μs with echo techniques. These results show that Ge hole singlet triplet qubits outperform their electronic Si and GaAs based counterparts in speed and coherence, respectively. In addition, they are on par with Ge single spin qubits, but can be operated at much lower fields underlining their potential for on chip integration with superconducting technologies. acknowledged_ssus: - _id: M-Shop - _id: NanoFab acknowledgement: This research was supported by the Scientific Service Units of Institute of Science and Technology (IST) Austria through resources provided by the Miba Machine Shop and the nanofabrication facility, and was made possible with the support of the NOMIS Foundation. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under Marie Sklodowska-Curie grant agreements no. 844511 and no. 75441, and by the Austrian Science Fund FWF-P 30207 project. A.B. acknowledges support from the European Union Horizon 2020 FET project microSPIRE, no. 766955. M. Botifoll and J.A. acknowledge funding from Generalitat de Catalunya 2017 SGR 327. The Catalan Institute of Nanoscience and Nanotechnology (ICN2) is supported by the Severo Ochoa programme from the Spanish Ministery of Economy (MINECO) (grant no. SEV-2017-0706) and is funded by the Catalonian Research Centre (CERCA) Programme, Generalitat de Catalunya. Part of the present work has been performed within the framework of the Universitat Autónoma de Barcelona Materials Science PhD programme. Part of the HAADF scanning transmission electron microscopy was conducted in the Laboratorio de Microscopias Avanzadas at Instituto de Nanociencia de Aragon, Universidad de Zaragoza. ICN2 acknowledge support from the Spanish Superior Council of Scientific Research (CSIC) Research Platform on Quantum Technologies PTI-001. M.B. acknowledges funding from the Catalan Agency for Management of University and Research Grants (AGAUR) Generalitat de Catalunya formation of investigators (FI) PhD grant. article_processing_charge: No article_type: original author: - first_name: Daniel full_name: Jirovec, Daniel id: 4C473F58-F248-11E8-B48F-1D18A9856A87 last_name: Jirovec orcid: 0000-0002-7197-4801 - first_name: Andrea C full_name: Hofmann, Andrea C id: 340F461A-F248-11E8-B48F-1D18A9856A87 last_name: Hofmann - first_name: Andrea full_name: Ballabio, Andrea last_name: Ballabio - first_name: Philipp M. full_name: Mutter, Philipp M. last_name: Mutter - first_name: Giulio full_name: Tavani, Giulio last_name: Tavani - first_name: Marc full_name: Botifoll, Marc last_name: Botifoll - first_name: Alessandro full_name: Crippa, Alessandro id: 1F2B21A2-F6E7-11E9-9B82-F7DBE5697425 last_name: Crippa orcid: 0000-0002-2968-611X - first_name: Josip full_name: Kukucka, Josip id: 3F5D8856-F248-11E8-B48F-1D18A9856A87 last_name: Kukucka - first_name: Oliver full_name: Sagi, Oliver id: 71616374-A8E9-11E9-A7CA-09ECE5697425 last_name: Sagi - first_name: Frederico full_name: Martins, Frederico id: 38F80F9A-1CB8-11EA-BC76-B49B3DDC885E last_name: Martins orcid: 0000-0003-2668-2401 - first_name: Jaime full_name: Saez Mollejo, Jaime id: e0390f72-f6e0-11ea-865d-862393336714 last_name: Saez Mollejo - first_name: Ivan full_name: Prieto Gonzalez, Ivan id: 2A307FE2-F248-11E8-B48F-1D18A9856A87 last_name: Prieto Gonzalez orcid: 0000-0002-7370-5357 - first_name: Maksim full_name: Borovkov, Maksim id: 2ac7a0a2-3562-11eb-9256-fbd18ea55087 last_name: Borovkov - first_name: Jordi full_name: Arbiol, Jordi last_name: Arbiol - first_name: Daniel full_name: Chrastina, Daniel last_name: Chrastina - first_name: Giovanni full_name: Isella, Giovanni last_name: Isella - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros orcid: 0000-0001-8342-202X citation: ama: Jirovec D, Hofmann AC, Ballabio A, et al. A singlet triplet hole spin qubit in planar Ge. Nature Materials. 2021;20(8):1106–1112. doi:10.1038/s41563-021-01022-2 apa: Jirovec, D., Hofmann, A. C., Ballabio, A., Mutter, P. M., Tavani, G., Botifoll, M., … Katsaros, G. (2021). A singlet triplet hole spin qubit in planar Ge. Nature Materials. Springer Nature. https://doi.org/10.1038/s41563-021-01022-2 chicago: Jirovec, Daniel, Andrea C Hofmann, Andrea Ballabio, Philipp M. Mutter, Giulio Tavani, Marc Botifoll, Alessandro Crippa, et al. “A Singlet Triplet Hole Spin Qubit in Planar Ge.” Nature Materials. Springer Nature, 2021. https://doi.org/10.1038/s41563-021-01022-2. ieee: D. Jirovec et al., “A singlet triplet hole spin qubit in planar Ge,” Nature Materials, vol. 20, no. 8. Springer Nature, pp. 1106–1112, 2021. ista: Jirovec D, Hofmann AC, Ballabio A, Mutter PM, Tavani G, Botifoll M, Crippa A, Kukucka J, Sagi O, Martins F, Saez Mollejo J, Prieto Gonzalez I, Borovkov M, Arbiol J, Chrastina D, Isella G, Katsaros G. 2021. A singlet triplet hole spin qubit in planar Ge. Nature Materials. 20(8), 1106–1112. mla: Jirovec, Daniel, et al. “A Singlet Triplet Hole Spin Qubit in Planar Ge.” Nature Materials, vol. 20, no. 8, Springer Nature, 2021, pp. 1106–1112, doi:10.1038/s41563-021-01022-2. short: D. Jirovec, A.C. Hofmann, A. Ballabio, P.M. Mutter, G. Tavani, M. Botifoll, A. Crippa, J. Kukucka, O. Sagi, F. Martins, J. Saez Mollejo, I. Prieto Gonzalez, M. Borovkov, J. Arbiol, D. Chrastina, G. Isella, G. Katsaros, Nature Materials 20 (2021) 1106–1112. date_created: 2020-12-02T10:50:47Z date_published: 2021-08-01T00:00:00Z date_updated: 2024-03-27T23:30:26Z day: '01' department: - _id: GeKa - _id: NanoFab - _id: GradSch doi: 10.1038/s41563-021-01022-2 ec_funded: 1 external_id: arxiv: - '2011.13755' isi: - '000657596400001' intvolume: ' 20' isi: 1 issue: '8' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2011.13755 month: '08' oa: 1 oa_version: Preprint page: 1106–1112 project: - _id: 26A151DA-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '844511' name: Majorana bound states in Ge/SiGe heterostructures - _id: 260C2330-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '754411' name: ISTplus - Postdoctoral Fellowships - _id: 2641CE5E-B435-11E9-9278-68D0E5697425 call_identifier: FWF grant_number: P30207 name: Hole spin orbit qubits in Ge quantum wells - _id: 262116AA-B435-11E9-9278-68D0E5697425 name: Hybrid Semiconductor - Superconductor Quantum Devices publication: Nature Materials publication_identifier: eissn: - 1476-4660 issn: - 1476-1122 publication_status: published publisher: Springer Nature quality_controlled: '1' related_material: link: - description: News on IST Homepage relation: press_release url: https://ist.ac.at/en/news/quantum-computing-with-holes/ record: - id: '9323' relation: research_data status: public - id: '10058' relation: dissertation_contains status: public scopus_import: '1' status: public title: A singlet triplet hole spin qubit in planar Ge type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 20 year: '2021' ... --- _id: '10066' abstract: - lang: eng text: The potential of Si and SiGe-based devices for the scaling of quantum circuits is tainted by device variability. Each device needs to be tuned to operation conditions. We give a key step towards tackling this variability with an algorithm that, without modification, is capable of tuning a 4-gate Si FinFET, a 5-gate GeSi nanowire and a 7-gate SiGe heterostructure double quantum dot device from scratch. We achieve tuning times of 30, 10, and 92 minutes, respectively. The algorithm also provides insight into the parameter space landscape for each of these devices. These results show that overarching solutions for the tuning of quantum devices are enabled by machine learning. acknowledged_ssus: - _id: NanoFab acknowledgement: "We acknowledge Ang Li, Erik P. A. M. Bakkers (University of Eindhoven) for the fabrication of the Ge/Si nanowire. This work was supported by the Royal Society, the EPSRC National Quantum Technology Hub in Networked Quantum Information Technology (EP/M013243/1), Quantum Technology Capital (EP/N014995/1), EPSRC Platform Grant\r\n(EP/R029229/1), the European Research Council (Grant agreement 948932), the Swiss Nanoscience Institute, the\r\nNCCR SPIN, the EU H2020 European Microkelvin Platform EMP grant No. 824109, the Scientific Service Units\r\nof IST Austria through resources provided by the nanofabrication facility and, the FWF-P30207 project. This publication was also made possible through support from Templeton World Charity Foundation and John Templeton Foundation. The opinions expressed in this publication are those of the authors and do not necessarily reflect the views of the Templeton Foundations." article_number: '2107.12975' article_processing_charge: No author: - first_name: B. full_name: Severin, B. last_name: Severin - first_name: D. T. full_name: Lennon, D. T. last_name: Lennon - first_name: L. C. full_name: Camenzind, L. C. last_name: Camenzind - first_name: F. full_name: Vigneau, F. last_name: Vigneau - first_name: F. full_name: Fedele, F. last_name: Fedele - first_name: Daniel full_name: Jirovec, Daniel id: 4C473F58-F248-11E8-B48F-1D18A9856A87 last_name: Jirovec orcid: 0000-0002-7197-4801 - first_name: A. full_name: Ballabio, A. last_name: Ballabio - first_name: D. full_name: Chrastina, D. last_name: Chrastina - first_name: G. full_name: Isella, G. last_name: Isella - first_name: M. de full_name: Kruijf, M. de last_name: Kruijf - first_name: M. J. full_name: Carballido, M. J. last_name: Carballido - first_name: S. full_name: Svab, S. last_name: Svab - first_name: A. V. full_name: Kuhlmann, A. V. last_name: Kuhlmann - first_name: F. R. full_name: Braakman, F. R. last_name: Braakman - first_name: S. full_name: Geyer, S. last_name: Geyer - first_name: F. N. M. full_name: Froning, F. N. M. last_name: Froning - first_name: H. full_name: Moon, H. last_name: Moon - first_name: M. A. full_name: Osborne, M. A. last_name: Osborne - first_name: D. full_name: Sejdinovic, D. last_name: Sejdinovic - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros orcid: 0000-0001-8342-202X - first_name: D. M. full_name: Zumbühl, D. M. last_name: Zumbühl - first_name: G. A. D. full_name: Briggs, G. A. D. last_name: Briggs - first_name: N. full_name: Ares, N. last_name: Ares citation: ama: Severin B, Lennon DT, Camenzind LC, et al. Cross-architecture tuning of silicon and SiGe-based quantum devices using machine learning. arXiv. doi:10.48550/arXiv.2107.12975 apa: Severin, B., Lennon, D. T., Camenzind, L. C., Vigneau, F., Fedele, F., Jirovec, D., … Ares, N. (n.d.). Cross-architecture tuning of silicon and SiGe-based quantum devices using machine learning. arXiv. https://doi.org/10.48550/arXiv.2107.12975 chicago: Severin, B., D. T. Lennon, L. C. Camenzind, F. Vigneau, F. Fedele, Daniel Jirovec, A. Ballabio, et al. “Cross-Architecture Tuning of Silicon and SiGe-Based Quantum Devices Using Machine Learning.” ArXiv, n.d. https://doi.org/10.48550/arXiv.2107.12975. ieee: B. Severin et al., “Cross-architecture tuning of silicon and SiGe-based quantum devices using machine learning,” arXiv. . ista: Severin B, Lennon DT, Camenzind LC, Vigneau F, Fedele F, Jirovec D, Ballabio A, Chrastina D, Isella G, Kruijf M de, Carballido MJ, Svab S, Kuhlmann AV, Braakman FR, Geyer S, Froning FNM, Moon H, Osborne MA, Sejdinovic D, Katsaros G, Zumbühl DM, Briggs GAD, Ares N. Cross-architecture tuning of silicon and SiGe-based quantum devices using machine learning. arXiv, 2107.12975. mla: Severin, B., et al. “Cross-Architecture Tuning of Silicon and SiGe-Based Quantum Devices Using Machine Learning.” ArXiv, 2107.12975, doi:10.48550/arXiv.2107.12975. short: B. Severin, D.T. Lennon, L.C. Camenzind, F. Vigneau, F. Fedele, D. Jirovec, A. Ballabio, D. Chrastina, G. Isella, M. de Kruijf, M.J. Carballido, S. Svab, A.V. Kuhlmann, F.R. Braakman, S. Geyer, F.N.M. Froning, H. Moon, M.A. Osborne, D. Sejdinovic, G. Katsaros, D.M. Zumbühl, G.A.D. Briggs, N. Ares, ArXiv (n.d.). date_created: 2021-10-01T12:40:22Z date_published: 2021-07-27T00:00:00Z date_updated: 2024-03-27T23:30:26Z day: '27' department: - _id: GeKa doi: 10.48550/arXiv.2107.12975 external_id: arxiv: - '2107.12975' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2107.12975 month: '07' oa: 1 oa_version: Preprint project: - _id: 2641CE5E-B435-11E9-9278-68D0E5697425 call_identifier: FWF grant_number: P30207 name: Hole spin orbit qubits in Ge quantum wells publication: arXiv publication_status: submitted related_material: record: - id: '10058' relation: dissertation_contains status: public status: public title: Cross-architecture tuning of silicon and SiGe-based quantum devices using machine learning type: preprint user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2021' ... --- _id: '8834' abstract: - lang: eng text: "This data collection contains the transport data for figures presented in the supplementary material of \"Enhancement of Proximity Induced Superconductivity in Planar Germanium\" by K. Aggarwal, et. al. \r\nThe measurements were done using Labber Software and the data is stored in the hdf5 file format. The files can be opened using either the Labber Log Browser (https://labber.org/overview/) or Labber Python API (http://labber.org/online-doc/api/LogFile.html).\r\n" article_processing_charge: No author: - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros orcid: 0000-0001-8342-202X citation: ama: Katsaros G. Enhancement of proximity induced superconductivity in planar Germanium. 2020. doi:10.15479/AT:ISTA:8834 apa: Katsaros, G. (2020). Enhancement of proximity induced superconductivity in planar Germanium. Institute of Science and Technology Austria. https://doi.org/10.15479/AT:ISTA:8834 chicago: Katsaros, Georgios. “Enhancement of Proximity Induced Superconductivity in Planar Germanium.” Institute of Science and Technology Austria, 2020. https://doi.org/10.15479/AT:ISTA:8834. ieee: G. Katsaros, “Enhancement of proximity induced superconductivity in planar Germanium.” Institute of Science and Technology Austria, 2020. ista: Katsaros G. 2020. Enhancement of proximity induced superconductivity in planar Germanium, Institute of Science and Technology Austria, 10.15479/AT:ISTA:8834. mla: Katsaros, Georgios. Enhancement of Proximity Induced Superconductivity in Planar Germanium. Institute of Science and Technology Austria, 2020, doi:10.15479/AT:ISTA:8834. short: G. Katsaros, (2020). contributor: - contributor_type: project_member first_name: Kushagra id: b22ab905-3539-11eb-84c3-fc159dcd79cb last_name: Aggarwal - contributor_type: project_member first_name: Andrea C id: 340F461A-F248-11E8-B48F-1D18A9856A87 last_name: Hofmann - contributor_type: project_member first_name: Daniel id: 4C473F58-F248-11E8-B48F-1D18A9856A87 last_name: Jirovec - contributor_type: project_member first_name: Ivan id: 2A307FE2-F248-11E8-B48F-1D18A9856A87 last_name: Prieto Gonzalez - contributor_type: project_member first_name: Amir last_name: Sammak - contributor_type: project_member first_name: Marc last_name: Botifoll - contributor_type: project_member first_name: Sara last_name: Marti-Sanchez - contributor_type: project_member first_name: Menno last_name: Veldhorst - contributor_type: project_member first_name: Jordi last_name: Arbiol - contributor_type: project_member first_name: Giordano last_name: Scappucci - contributor_type: project_leader first_name: Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros date_created: 2020-12-02T10:49:30Z date_published: 2020-12-02T00:00:00Z date_updated: 2024-02-21T12:41:26Z day: '02' ddc: - 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lang: eng text: Semiconductor nanowires have been playing a crucial role in the development of nanoscale devices for the realization of spin qubits, Majorana fermions, single photon emitters, nanoprocessors, etc. The monolithic growth of site‐controlled nanowires is a prerequisite toward the next generation of devices that will require addressability and scalability. Here, combining top‐down nanofabrication and bottom‐up self‐assembly, the growth of Ge wires on prepatterned Si (001) substrates with controllable position, distance, length, and structure is reported. This is achieved by a novel growth process that uses a SiGe strain‐relaxation template and can be potentially generalized to other material combinations. Transport measurements show an electrically tunable spin–orbit coupling, with a spin–orbit length similar to that of III–V materials. Also, charge sensing between quantum dots in closely spaced wires is observed, which underlines their potential for the realization of advanced quantum devices. The reported results open a path toward scalable qubit devices using nanowires on silicon. acknowledged_ssus: - _id: NanoFab - _id: M-Shop acknowledgement: 'This work was supported by the National Key R&D Program of China (Grant Nos. 2016YFA0301701 and 2016YFA0300600), the NSFC (Grant Nos. 11574356, 11434010, and 11404252), the Strategic Priority Research Program of CAS (Grant No. XDB30000000), the ERC Starting Grant No. 335497, the FWF P32235 project, and the European Union''s Horizon 2020 research and innovation program under Grant Agreement #862046. This research was supported by the Scientific Service Units of IST Austria through resources provided by the MIBA Machine Shop and the nanofabrication facility. F.L. thanks support from DOE (Grant No. DE‐FG02‐04ER46148). H.H. thanks the Startup Funding from Xi''an Jiaotong University.' article_number: '1906523' article_processing_charge: Yes (via OA deal) article_type: original author: - first_name: Fei full_name: Gao, Fei last_name: Gao - first_name: Jian-Huan full_name: Wang, Jian-Huan last_name: Wang - first_name: Hannes full_name: Watzinger, Hannes id: 35DF8E50-F248-11E8-B48F-1D18A9856A87 last_name: Watzinger - first_name: Hao full_name: Hu, Hao last_name: Hu - first_name: Marko J. full_name: Rančić, Marko J. last_name: Rančić - first_name: Jie-Yin full_name: Zhang, Jie-Yin last_name: Zhang - first_name: Ting full_name: Wang, Ting last_name: Wang - first_name: Yuan full_name: Yao, Yuan last_name: Yao - first_name: Gui-Lei full_name: Wang, Gui-Lei last_name: Wang - first_name: Josip full_name: Kukucka, Josip id: 3F5D8856-F248-11E8-B48F-1D18A9856A87 last_name: Kukucka - first_name: Lada full_name: Vukušić, Lada id: 31E9F056-F248-11E8-B48F-1D18A9856A87 last_name: Vukušić orcid: 0000-0003-2424-8636 - first_name: Christoph full_name: Kloeffel, Christoph last_name: Kloeffel - first_name: Daniel full_name: Loss, Daniel last_name: Loss - first_name: Feng full_name: Liu, Feng last_name: Liu - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros orcid: 0000-0001-8342-202X - first_name: Jian-Jun full_name: Zhang, Jian-Jun last_name: Zhang citation: ama: Gao F, Wang J-H, Watzinger H, et al. Site-controlled uniform Ge/Si hut wires with electrically tunable spin-orbit coupling. Advanced Materials. 2020;32(16). doi:10.1002/adma.201906523 apa: Gao, F., Wang, J.-H., Watzinger, H., Hu, H., Rančić, M. J., Zhang, J.-Y., … Zhang, J.-J. (2020). Site-controlled uniform Ge/Si hut wires with electrically tunable spin-orbit coupling. Advanced Materials. Wiley. https://doi.org/10.1002/adma.201906523 chicago: Gao, Fei, Jian-Huan Wang, Hannes Watzinger, Hao Hu, Marko J. Rančić, Jie-Yin Zhang, Ting Wang, et al. “Site-Controlled Uniform Ge/Si Hut Wires with Electrically Tunable Spin-Orbit Coupling.” Advanced Materials. Wiley, 2020. https://doi.org/10.1002/adma.201906523. ieee: F. Gao et al., “Site-controlled uniform Ge/Si hut wires with electrically tunable spin-orbit coupling,” Advanced Materials, vol. 32, no. 16. Wiley, 2020. ista: Gao F, Wang J-H, Watzinger H, Hu H, Rančić MJ, Zhang J-Y, Wang T, Yao Y, Wang G-L, Kukucka J, Vukušić L, Kloeffel C, Loss D, Liu F, Katsaros G, Zhang J-J. 2020. Site-controlled uniform Ge/Si hut wires with electrically tunable spin-orbit coupling. Advanced Materials. 32(16), 1906523. mla: Gao, Fei, et al. “Site-Controlled Uniform Ge/Si Hut Wires with Electrically Tunable Spin-Orbit Coupling.” Advanced Materials, vol. 32, no. 16, 1906523, Wiley, 2020, doi:10.1002/adma.201906523. short: F. Gao, J.-H. Wang, H. Watzinger, H. Hu, M.J. Rančić, J.-Y. Zhang, T. Wang, Y. Yao, G.-L. Wang, J. Kukucka, L. Vukušić, C. Kloeffel, D. Loss, F. Liu, G. Katsaros, J.-J. Zhang, Advanced Materials 32 (2020). date_created: 2020-02-28T09:47:00Z date_published: 2020-04-23T00:00:00Z date_updated: 2024-02-21T12:42:12Z day: '23' ddc: - '530' department: - _id: GeKa doi: 10.1002/adma.201906523 ec_funded: 1 external_id: isi: - '000516660900001' file: - access_level: open_access checksum: c622737dc295972065782558337124a2 content_type: application/pdf creator: dernst date_created: 2020-11-20T10:11:35Z date_updated: 2020-11-20T10:11:35Z file_id: '8782' file_name: 2020_AdvancedMaterials_Gao.pdf file_size: 5242880 relation: main_file success: 1 file_date_updated: 2020-11-20T10:11:35Z has_accepted_license: '1' intvolume: ' 32' isi: 1 issue: '16' language: - iso: eng month: '04' oa: 1 oa_version: Published Version project: - _id: 25517E86-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '335497' name: Towards Spin qubits and Majorana fermions in Germanium selfassembled hut-wires - _id: 237B3DA4-32DE-11EA-91FC-C7463DDC885E call_identifier: FWF grant_number: P32235 name: Towards scalable hut wire quantum devices - _id: 237E5020-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '862046' name: TOPOLOGICALLY PROTECTED AND SCALABLE QUANTUM BITS publication: Advanced Materials publication_identifier: issn: - 0935-9648 publication_status: published publisher: Wiley quality_controlled: '1' related_material: record: - id: '7996' relation: dissertation_contains status: public - id: '9222' relation: research_data status: public scopus_import: '1' status: public title: Site-controlled uniform Ge/Si hut wires with electrically tunable spin-orbit coupling tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 32 year: '2020' ... --- _id: '9222' article_processing_charge: No author: - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros orcid: 0000-0001-8342-202X citation: ama: 'Katsaros G. Transport data for: Site‐controlled uniform Ge/Si Hut wires with electrically tunable spin–orbit coupling. 2020. doi:10.15479/AT:ISTA:9222' apa: 'Katsaros, G. (2020). Transport data for: Site‐controlled uniform Ge/Si Hut wires with electrically tunable spin–orbit coupling. Institute of Science and Technology Austria. https://doi.org/10.15479/AT:ISTA:9222' chicago: 'Katsaros, Georgios. “Transport Data for: Site‐controlled Uniform Ge/Si Hut Wires with Electrically Tunable Spin–Orbit Coupling.” Institute of Science and Technology Austria, 2020. https://doi.org/10.15479/AT:ISTA:9222.' ieee: 'G. Katsaros, “Transport data for: Site‐controlled uniform Ge/Si Hut wires with electrically tunable spin–orbit coupling.” Institute of Science and Technology Austria, 2020.' ista: 'Katsaros G. 2020. Transport data for: Site‐controlled uniform Ge/Si Hut wires with electrically tunable spin–orbit coupling, Institute of Science and Technology Austria, 10.15479/AT:ISTA:9222.' mla: 'Katsaros, Georgios. Transport Data for: Site‐controlled Uniform Ge/Si Hut Wires with Electrically Tunable Spin–Orbit Coupling. Institute of Science and Technology Austria, 2020, doi:10.15479/AT:ISTA:9222.' short: G. Katsaros, (2020). contributor: - contributor_type: research_group first_name: Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros date_created: 2021-03-05T18:00:47Z date_published: 2020-03-16T00:00:00Z date_updated: 2024-02-21T12:42:13Z day: '16' ddc: - '530' department: - _id: GeKa doi: 10.15479/AT:ISTA:9222 file: - access_level: open_access checksum: 41b66e195ed3dbd73077feee77b05652 content_type: application/x-zip-compressed creator: gkatsaro date_created: 2021-03-05T17:50:45Z date_updated: 2021-03-05T17:50:45Z file_id: '9223' file_name: DOI_SiteControlledHWs.zip file_size: 13317557 relation: main_file - access_level: open_access checksum: a1dc5f710ba4b3bb7f248195ba754ab2 content_type: text/plain creator: dernst date_created: 2021-03-10T07:31:50Z date_updated: 2021-03-10T07:31:50Z file_id: '9233' file_name: Readme.txt file_size: 3515 relation: main_file success: 1 file_date_updated: 2021-03-10T07:31:50Z has_accepted_license: '1' month: '03' oa: 1 oa_version: Published Version publisher: Institute of Science and Technology Austria related_material: record: - id: '7541' relation: used_in_publication status: public status: public title: 'Transport data for: Site‐controlled uniform Ge/Si Hut wires with electrically tunable spin–orbit coupling' tmp: image: /images/cc_0.png legal_code_url: https://creativecommons.org/publicdomain/zero/1.0/legalcode name: Creative Commons Public Domain Dedication (CC0 1.0) short: CC0 (1.0) type: research_data user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2020' ... --- _id: '8203' abstract: - lang: eng text: Using inelastic cotunneling spectroscopy we observe a zero field splitting within the spin triplet manifold of Ge hut wire quantum dots. The states with spin ±1 in the confinement direction are energetically favored by up to 55 μeV compared to the spin 0 triplet state because of the strong spin–orbit coupling. The reported effect should be observable in a broad class of strongly confined hole quantum-dot systems and might need to be considered when operating hole spin qubits. acknowledged_ssus: - _id: NanoFab - _id: M-Shop acknowledgement: "We acknowledge G. Burkard, V. N. Golovach, C. Kloeffel, D.Loss, P. Rabl, and M. Rancič ́ for helpful discussions. We\r\nfurther acknowledge T. Adletzberger, J. Aguilera, T. Asenov, S. Bagiante, T. Menner, L. Shafeek, P. Taus, P. Traunmüller, and D. Waldhausl for their invaluable assistance. This research was supported by the Scientific Service Units of IST Austria through resources provided by the MIBA Machine Shop and the nanofabrication facility, by the FWF-P 32235 project, by the National Key R&D Program of China (2016YFA0301701, 2016YFA0300600), and by the European Union’s Horizon 2020 research and innovation program under grant agreement no. 862046. All data of this publication are available at 10.15479/AT:ISTA:7689." article_processing_charge: Yes (via OA deal) article_type: original author: - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros orcid: 0000-0001-8342-202X - first_name: Josip full_name: Kukucka, Josip id: 3F5D8856-F248-11E8-B48F-1D18A9856A87 last_name: Kukucka - first_name: Lada full_name: Vukušić, Lada id: 31E9F056-F248-11E8-B48F-1D18A9856A87 last_name: Vukušić orcid: 0000-0003-2424-8636 - first_name: Hannes full_name: Watzinger, Hannes id: 35DF8E50-F248-11E8-B48F-1D18A9856A87 last_name: Watzinger - first_name: Fei full_name: Gao, Fei last_name: Gao - first_name: Ting full_name: Wang, Ting last_name: Wang orcid: 0000-0002-4619-9575 - first_name: Jian-Jun full_name: Zhang, Jian-Jun last_name: Zhang - first_name: Karsten full_name: Held, Karsten last_name: Held citation: ama: Katsaros G, Kukucka J, Vukušić L, et al. Zero field splitting of heavy-hole states in quantum dots. Nano Letters. 2020;20(7):5201-5206. doi:10.1021/acs.nanolett.0c01466 apa: Katsaros, G., Kukucka, J., Vukušić, L., Watzinger, H., Gao, F., Wang, T., … Held, K. (2020). Zero field splitting of heavy-hole states in quantum dots. Nano Letters. American Chemical Society. https://doi.org/10.1021/acs.nanolett.0c01466 chicago: Katsaros, Georgios, Josip Kukucka, Lada Vukušić, Hannes Watzinger, Fei Gao, Ting Wang, Jian-Jun Zhang, and Karsten Held. “Zero Field Splitting of Heavy-Hole States in Quantum Dots.” Nano Letters. American Chemical Society, 2020. https://doi.org/10.1021/acs.nanolett.0c01466. ieee: G. Katsaros et al., “Zero field splitting of heavy-hole states in quantum dots,” Nano Letters, vol. 20, no. 7. American Chemical Society, pp. 5201–5206, 2020. ista: Katsaros G, Kukucka J, Vukušić L, Watzinger H, Gao F, Wang T, Zhang J-J, Held K. 2020. Zero field splitting of heavy-hole states in quantum dots. Nano Letters. 20(7), 5201–5206. mla: Katsaros, Georgios, et al. “Zero Field Splitting of Heavy-Hole States in Quantum Dots.” Nano Letters, vol. 20, no. 7, American Chemical Society, 2020, pp. 5201–06, doi:10.1021/acs.nanolett.0c01466. short: G. Katsaros, J. Kukucka, L. Vukušić, H. Watzinger, F. Gao, T. Wang, J.-J. Zhang, K. Held, Nano Letters 20 (2020) 5201–5206. date_created: 2020-08-06T09:25:04Z date_published: 2020-06-01T00:00:00Z date_updated: 2024-02-21T12:44:01Z day: '01' ddc: - '530' department: - _id: GeKa doi: 10.1021/acs.nanolett.0c01466 ec_funded: 1 external_id: isi: - '000548893200066' pmid: - '32479090' file: - access_level: open_access content_type: application/pdf creator: dernst date_created: 2020-08-06T09:35:37Z date_updated: 2020-08-06T09:35:37Z file_id: '8204' file_name: 2020_NanoLetters_Katsaros.pdf file_size: 3308906 relation: main_file success: 1 file_date_updated: 2020-08-06T09:35:37Z has_accepted_license: '1' intvolume: ' 20' isi: 1 issue: '7' language: - iso: eng month: '06' oa: 1 oa_version: Published Version page: 5201-5206 pmid: 1 project: - _id: 237B3DA4-32DE-11EA-91FC-C7463DDC885E call_identifier: FWF grant_number: P32235 name: Towards scalable hut wire quantum devices - _id: 237E5020-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '862046' name: TOPOLOGICALLY PROTECTED AND SCALABLE QUANTUM BITS publication: Nano Letters publication_identifier: eissn: - 1530-6992 issn: - 1530-6984 publication_status: published publisher: American Chemical Society quality_controlled: '1' related_material: record: - id: '7689' relation: research_data status: public scopus_import: '1' status: public title: Zero field splitting of heavy-hole states in quantum dots tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 20 year: '2020' ... --- _id: '7689' abstract: - lang: eng text: "These are the supplementary research data to the publication \"Zero field splitting of heavy-hole states in quantum dots\". All matrix files have the same format. Within each column the bias voltage is changed. Each column corresponds to either a different gate voltage or magnetic field. The voltage values are given in mV, the current values in pA. Find a specific description in the included Readme file.\r\n" article_processing_charge: No author: - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros orcid: 0000-0001-8342-202X citation: ama: Katsaros G. Supplementary data for “Zero field splitting of heavy-hole states in quantum dots.” 2020. doi:10.15479/AT:ISTA:7689 apa: Katsaros, G. (2020). Supplementary data for “Zero field splitting of heavy-hole states in quantum dots.” Institute of Science and Technology Austria. https://doi.org/10.15479/AT:ISTA:7689 chicago: Katsaros, Georgios. “Supplementary Data for ‘Zero Field Splitting of Heavy-Hole States in Quantum Dots.’” Institute of Science and Technology Austria, 2020. https://doi.org/10.15479/AT:ISTA:7689. ieee: G. Katsaros, “Supplementary data for ‘Zero field splitting of heavy-hole states in quantum dots.’” Institute of Science and Technology Austria, 2020. ista: Katsaros G. 2020. Supplementary data for ‘Zero field splitting of heavy-hole states in quantum dots’, Institute of Science and Technology Austria, 10.15479/AT:ISTA:7689. mla: Katsaros, Georgios. Supplementary Data for “Zero Field Splitting of Heavy-Hole States in Quantum Dots.” Institute of Science and Technology Austria, 2020, doi:10.15479/AT:ISTA:7689. short: G. Katsaros, (2020). contributor: - contributor_type: contact_person first_name: Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros date_created: 2020-05-01T15:14:46Z date_published: 2020-05-01T00:00:00Z date_updated: 2024-02-21T12:44:02Z day: '01' ddc: - '530' department: - _id: GeKa doi: 10.15479/AT:ISTA:7689 ec_funded: 1 file: - access_level: open_access checksum: d23c0cb9e2d19e14e2f902b88b97c05d content_type: application/x-zip-compressed creator: gkatsaro date_created: 2020-05-01T15:13:28Z date_updated: 2020-07-14T12:48:02Z file_id: '7786' file_name: DOI_ZeroFieldSplitting.zip file_size: 5514403 relation: main_file file_date_updated: 2020-07-14T12:48:02Z has_accepted_license: '1' month: '05' oa: 1 oa_version: Published Version project: - _id: 237E5020-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '862046' name: TOPOLOGICALLY PROTECTED AND SCALABLE QUANTUM BITS - _id: 237B3DA4-32DE-11EA-91FC-C7463DDC885E call_identifier: FWF grant_number: P32235 name: Towards scalable hut wire quantum devices publisher: Institute of Science and Technology Austria related_material: record: - id: '8203' relation: used_in_publication status: public status: public title: Supplementary data for "Zero field splitting of heavy-hole states in quantum dots" tmp: image: /images/cc_0.png legal_code_url: https://creativecommons.org/publicdomain/zero/1.0/legalcode name: Creative Commons Public Domain Dedication (CC0 1.0) short: CC0 (1.0) type: research_data user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2020' ... --- _id: '8831' abstract: - lang: eng text: Holes in planar Ge have high mobilities, strong spin-orbit interaction and electrically tunable g-factors, and are therefore emerging as a promising candidate for hybrid superconductorsemiconductor devices. This is further motivated by the observation of supercurrent transport in planar Ge Josephson Field effect transistors (JoFETs). A key challenge towards hybrid germanium quantum technology is the design of high quality interfaces and superconducting contacts that are robust against magnetic fields. By combining the assets of Al, which has a long superconducting coherence, and Nb, which has a significant superconducting gap, we form low-disordered JoFETs with large ICRN products that are capable of withstanding high magnetic fields. We furthermore demonstrate the ability of phase-biasing individual JoFETs opening up an avenue to explore topological superconductivity in planar Ge. The persistence of superconductivity in the reported hybrid devices beyond 1.8 T paves the way towards integrating spin qubits and proximity-induced superconductivity on the same chip. acknowledged_ssus: - _id: M-Shop - _id: NanoFab acknowledgement: "This research and related results were made possible with the support of the NOMIS Foundation. This research was supported by the Scientific Service Units of IST Austria through resources provided by the MIBA Machine Shop and the nanofabrication facility, the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement #844511 and the Grant Agreement #862046. ICN2 acknowledge funding from Generalitat de Catalunya 2017 SGR 327. ICN2 is supported by the Severo Ochoa\r\nprogram from Spanish MINECO (Grant No. SEV2017-0706) and is funded by the CERCA Programme / Generalitat de Catalunya. Part of the present work has been performed in the framework of Universitat Aut`onoma de Barcelona Materials Science PhD program. The HAADF-STEM microscopy was conducted in the Laboratorio de Microscopias Avanzadas at Instituto de Nanociencia de Aragon-Universidad de Zaragoza. Authors acknowledge the LMA-INA for offering access to their instruments and expertise. We acknowledge support from CSIC Research Platform on Quantum Technologies PTI-001. This project has received funding from\r\nthe European Union’s Horizon 2020 research and innovation programme under grant agreement No 823717 – ESTEEM3. M.B. acknowledges support from SUR Generalitat de Catalunya and the EU Social Fund; project ref. 2020 FI 00103. GS and MV acknowledge support through a projectruimte grant associated with the Netherlands Organization of Scientific Research (NWO)." article_number: '2012.00322' article_processing_charge: No author: - first_name: Kushagra full_name: Aggarwal, Kushagra id: b22ab905-3539-11eb-84c3-fc159dcd79cb last_name: Aggarwal orcid: 0000-0001-9985-9293 - first_name: Andrea C full_name: Hofmann, Andrea C id: 340F461A-F248-11E8-B48F-1D18A9856A87 last_name: Hofmann - first_name: Daniel full_name: Jirovec, Daniel id: 4C473F58-F248-11E8-B48F-1D18A9856A87 last_name: Jirovec orcid: 0000-0002-7197-4801 - first_name: Ivan full_name: Prieto Gonzalez, Ivan id: 2A307FE2-F248-11E8-B48F-1D18A9856A87 last_name: Prieto Gonzalez orcid: 0000-0002-7370-5357 - first_name: Amir full_name: Sammak, Amir last_name: Sammak - first_name: Marc full_name: Botifoll, Marc last_name: Botifoll - first_name: Sara full_name: Marti-Sanchez, Sara last_name: Marti-Sanchez - first_name: Menno full_name: Veldhorst, Menno last_name: Veldhorst - first_name: Jordi full_name: Arbiol, Jordi last_name: Arbiol - first_name: Giordano full_name: Scappucci, Giordano last_name: Scappucci - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros orcid: 0000-0001-8342-202X citation: ama: Aggarwal K, Hofmann AC, Jirovec D, et al. Enhancement of proximity induced superconductivity in planar Germanium. arXiv. apa: Aggarwal, K., Hofmann, A. C., Jirovec, D., Prieto Gonzalez, I., Sammak, A., Botifoll, M., … Katsaros, G. (n.d.). Enhancement of proximity induced superconductivity in planar Germanium. arXiv. chicago: Aggarwal, Kushagra, Andrea C Hofmann, Daniel Jirovec, Ivan Prieto Gonzalez, Amir Sammak, Marc Botifoll, Sara Marti-Sanchez, et al. “Enhancement of Proximity Induced Superconductivity in Planar Germanium.” ArXiv, n.d. ieee: K. Aggarwal et al., “Enhancement of proximity induced superconductivity in planar Germanium,” arXiv. . ista: Aggarwal K, Hofmann AC, Jirovec D, Prieto Gonzalez I, Sammak A, Botifoll M, Marti-Sanchez S, Veldhorst M, Arbiol J, Scappucci G, Katsaros G. Enhancement of proximity induced superconductivity in planar Germanium. arXiv, 2012.00322. mla: Aggarwal, Kushagra, et al. “Enhancement of Proximity Induced Superconductivity in Planar Germanium.” ArXiv, 2012.00322. short: K. Aggarwal, A.C. Hofmann, D. Jirovec, I. Prieto Gonzalez, A. Sammak, M. Botifoll, S. Marti-Sanchez, M. Veldhorst, J. Arbiol, G. Scappucci, G. Katsaros, ArXiv (n.d.). date_created: 2020-12-02T10:42:53Z date_published: 2020-12-02T00:00:00Z date_updated: 2024-03-27T23:30:26Z day: '02' ddc: - '530' department: - _id: GeKa ec_funded: 1 external_id: arxiv: - '2012.00322' file: - access_level: open_access checksum: 22a612e206232fa94b138b2c2f957582 content_type: application/pdf creator: gkatsaro date_created: 2020-12-02T10:42:31Z date_updated: 2020-12-02T10:42:31Z file_id: '8832' file_name: Superconducting_2D_Ge.pdf file_size: 1697939 relation: main_file file_date_updated: 2020-12-02T10:42:31Z has_accepted_license: '1' language: - iso: eng month: '12' oa: 1 oa_version: Submitted Version project: - _id: 262116AA-B435-11E9-9278-68D0E5697425 name: Hybrid Semiconductor - Superconductor Quantum Devices - _id: 26A151DA-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '844511' name: Majorana bound states in Ge/SiGe heterostructures - _id: 237E5020-32DE-11EA-91FC-C7463DDC885E call_identifier: H2020 grant_number: '862046' name: TOPOLOGICALLY PROTECTED AND SCALABLE QUANTUM BITS publication: arXiv publication_status: submitted related_material: record: - id: '10559' relation: later_version status: public - id: '8834' relation: research_data status: public - id: '10058' relation: dissertation_contains status: public status: public title: Enhancement of proximity induced superconductivity in planar Germanium type: preprint user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2020' ... --- _id: '10065' abstract: - lang: eng text: We study double quantum dots in a Ge/SiGe heterostructure and test their maturity towards singlet-triplet ($S-T_0$) qubits. We demonstrate a large range of tunability, from two single quantum dots to a double quantum dot. We measure Pauli spin blockade and study the anisotropy of the $g$-factor. We use an adjacent quantum dot for sensing charge transitions in the double quantum dot at interest. In conclusion, Ge/SiGe possesses all ingredients necessary for building a singlet-triplet qubit. acknowledged_ssus: - _id: M-Shop - _id: NanoFab acknowledgement: "We thank Matthias Brauns for helpful discussions and careful proofreading of the manuscript. This project has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement No 844511 and from the FWF project P30207. The research was supported by the Scientific Service Units of IST Austria through resources provided by the MIBA machine shop and the nanofabrication\r\nfacility." article_number: '1910.05841' article_processing_charge: No author: - first_name: Andrea C full_name: Hofmann, Andrea C id: 340F461A-F248-11E8-B48F-1D18A9856A87 last_name: Hofmann - first_name: Daniel full_name: Jirovec, Daniel id: 4C473F58-F248-11E8-B48F-1D18A9856A87 last_name: Jirovec orcid: 0000-0002-7197-4801 - first_name: Maxim full_name: Borovkov, Maxim last_name: Borovkov - first_name: Ivan full_name: Prieto Gonzalez, Ivan id: 2A307FE2-F248-11E8-B48F-1D18A9856A87 last_name: Prieto Gonzalez orcid: 0000-0002-7370-5357 - first_name: Andrea full_name: Ballabio, Andrea last_name: Ballabio - first_name: Jacopo full_name: Frigerio, Jacopo last_name: Frigerio - first_name: Daniel full_name: Chrastina, Daniel last_name: Chrastina - first_name: Giovanni full_name: Isella, Giovanni last_name: Isella - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros orcid: 0000-0001-8342-202X citation: ama: Hofmann AC, Jirovec D, Borovkov M, et al. Assessing the potential of Ge/SiGe quantum dots as hosts for singlet-triplet qubits. arXiv. doi:10.48550/arXiv.1910.05841 apa: Hofmann, A. C., Jirovec, D., Borovkov, M., Prieto Gonzalez, I., Ballabio, A., Frigerio, J., … Katsaros, G. (n.d.). Assessing the potential of Ge/SiGe quantum dots as hosts for singlet-triplet qubits. arXiv. https://doi.org/10.48550/arXiv.1910.05841 chicago: Hofmann, Andrea C, Daniel Jirovec, Maxim Borovkov, Ivan Prieto Gonzalez, Andrea Ballabio, Jacopo Frigerio, Daniel Chrastina, Giovanni Isella, and Georgios Katsaros. “Assessing the Potential of Ge/SiGe Quantum Dots as Hosts for Singlet-Triplet Qubits.” ArXiv, n.d. https://doi.org/10.48550/arXiv.1910.05841. ieee: A. C. Hofmann et al., “Assessing the potential of Ge/SiGe quantum dots as hosts for singlet-triplet qubits,” arXiv. . ista: Hofmann AC, Jirovec D, Borovkov M, Prieto Gonzalez I, Ballabio A, Frigerio J, Chrastina D, Isella G, Katsaros G. Assessing the potential of Ge/SiGe quantum dots as hosts for singlet-triplet qubits. arXiv, 1910.05841. mla: Hofmann, Andrea C., et al. “Assessing the Potential of Ge/SiGe Quantum Dots as Hosts for Singlet-Triplet Qubits.” ArXiv, 1910.05841, doi:10.48550/arXiv.1910.05841. short: A.C. Hofmann, D. Jirovec, M. Borovkov, I. Prieto Gonzalez, A. Ballabio, J. Frigerio, D. Chrastina, G. Isella, G. Katsaros, ArXiv (n.d.). date_created: 2021-10-01T12:14:51Z date_published: 2019-10-13T00:00:00Z date_updated: 2024-03-27T23:30:26Z day: '13' department: - _id: GeKa doi: 10.48550/arXiv.1910.05841 ec_funded: 1 external_id: arxiv: - '1910.05841' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1910.05841 month: '10' oa: 1 oa_version: Preprint project: - _id: 26A151DA-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '844511' name: Majorana bound states in Ge/SiGe heterostructures - _id: 2641CE5E-B435-11E9-9278-68D0E5697425 call_identifier: FWF grant_number: P30207 name: Hole spin orbit qubits in Ge quantum wells publication: arXiv publication_status: submitted related_material: record: - id: '10058' relation: dissertation_contains status: public status: public title: Assessing the potential of Ge/SiGe quantum dots as hosts for singlet-triplet qubits type: preprint user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2019' ... --- _id: '77' abstract: - lang: eng text: Holes confined in quantum dots have gained considerable interest in the past few years due to their potential as spin qubits. Here we demonstrate two-axis control of a spin 3/2 qubit in natural Ge. The qubit is formed in a hut wire double quantum dot device. The Pauli spin blockade principle allowed us to demonstrate electric dipole spin resonance by applying a radio frequency electric field to one of the electrodes defining the double quantum dot. Coherent hole spin oscillations with Rabi frequencies reaching 140 MHz are demonstrated and dephasing times of 130 ns are measured. The reported results emphasize the potential of Ge as a platform for fast and electrically tunable hole spin qubit devices. acknowledged_ssus: - _id: M-Shop - _id: NanoFab article_processing_charge: Yes article_type: original author: - first_name: Hannes full_name: Watzinger, Hannes id: 35DF8E50-F248-11E8-B48F-1D18A9856A87 last_name: Watzinger - first_name: Josip full_name: Kukucka, Josip id: 3F5D8856-F248-11E8-B48F-1D18A9856A87 last_name: Kukucka - first_name: Lada full_name: Vukusic, Lada id: 31E9F056-F248-11E8-B48F-1D18A9856A87 last_name: Vukusic orcid: 0000-0003-2424-8636 - first_name: Fei full_name: Gao, Fei last_name: Gao - first_name: Ting full_name: Wang, Ting last_name: Wang - first_name: Friedrich full_name: Schäffler, Friedrich last_name: Schäffler - first_name: Jian full_name: Zhang, Jian last_name: Zhang - first_name: Georgios full_name: Katsaros, Georgios id: 38DB5788-F248-11E8-B48F-1D18A9856A87 last_name: Katsaros orcid: 0000-0001-8342-202X citation: ama: Watzinger H, Kukucka J, Vukušić L, et al. A germanium hole spin qubit. Nature Communications. 2018;9(3902). doi:10.1038/s41467-018-06418-4 apa: Watzinger, H., Kukucka, J., Vukušić, L., Gao, F., Wang, T., Schäffler, F., … Katsaros, G. (2018). A germanium hole spin qubit. Nature Communications. Nature Publishing Group. https://doi.org/10.1038/s41467-018-06418-4 chicago: Watzinger, Hannes, Josip Kukucka, Lada Vukušić, Fei Gao, Ting Wang, Friedrich Schäffler, Jian Zhang, and Georgios Katsaros. “A Germanium Hole Spin Qubit.” Nature Communications. Nature Publishing Group, 2018. https://doi.org/10.1038/s41467-018-06418-4. ieee: H. Watzinger et al., “A germanium hole spin qubit,” Nature Communications, vol. 9, no. 3902. Nature Publishing Group, 2018. ista: Watzinger H, Kukucka J, Vukušić L, Gao F, Wang T, Schäffler F, Zhang J, Katsaros G. 2018. A germanium hole spin qubit. Nature Communications. 9(3902). mla: Watzinger, Hannes, et al. “A Germanium Hole Spin Qubit.” Nature Communications, vol. 9, no. 3902, Nature Publishing Group, 2018, doi:10.1038/s41467-018-06418-4. short: H. Watzinger, J. Kukucka, L. Vukušić, F. Gao, T. Wang, F. Schäffler, J. Zhang, G. Katsaros, Nature Communications 9 (2018). date_created: 2018-12-11T11:44:30Z date_published: 2018-09-25T00:00:00Z date_updated: 2023-09-08T11:44:02Z day: '25' ddc: - '530' department: - _id: GeKa doi: 10.1038/s41467-018-06418-4 ec_funded: 1 external_id: isi: - '000445560800010' file: - access_level: open_access checksum: e7148c10a64497e279c4de570b6cc544 content_type: application/pdf creator: dernst date_created: 2018-12-17T10:28:30Z date_updated: 2020-07-14T12:48:02Z file_id: '5687' file_name: 2018_NatureComm_Watzinger.pdf file_size: 1063469 relation: main_file file_date_updated: 2020-07-14T12:48:02Z has_accepted_license: '1' intvolume: ' 9' isi: 1 issue: '3902 ' language: - iso: eng month: '09' oa: 1 oa_version: Published Version project: - _id: 25517E86-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '335497' name: Towards Spin qubits and Majorana fermions in Germanium selfassembled hut-wires - _id: 2552F888-B435-11E9-9278-68D0E5697425 call_identifier: FWF grant_number: Y00715 name: Loch Spin-Qubits und Majorana-Fermionen in Germanium publication: Nature Communications publication_status: published publisher: Nature Publishing Group quality_controlled: '1' related_material: record: - id: '7977' relation: popular_science - id: '7996' relation: dissertation_contains status: public scopus_import: '1' status: public title: A germanium hole spin qubit tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 9 year: '2018' ...