---
_id: '11592'
abstract:
- lang: eng
text: 'We compare recent experimental results [Science 375, 528 (2022)] of the superfluid
unitary Fermi gas near the critical temperature with a thermodynamic model based
on the elementary excitations of the system. We find good agreement between experimental
data and our theory for several quantities such as first sound, second sound,
and superfluid fraction. We also show that mode mixing between first and second
sound occurs. Finally, we characterize the response amplitude to a density perturbation:
Close to the critical temperature both first and second sound can be excited through
a density perturbation, whereas at lower temperatures only the first sound mode
exhibits a significant response.'
acknowledgement: The authors gratefully acknowledge stimulating discussions with T.
Enss, and thank an anonymous referee for suggestions and remarks that allowed us
to improve the original manuscript. This work is supported by the Deutsche Forschungsgemeinschaft
(DFG, German Research Foundation) under Germany’s Excellence Strategy EXC2181/1-390900948
(the Heidelberg STRUCTURES Excellence Cluster).
article_number: '063329'
article_processing_charge: No
article_type: original
author:
- first_name: Giacomo
full_name: Bighin, Giacomo
id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
last_name: Bighin
orcid: 0000-0001-8823-9777
- first_name: Alberto
full_name: Cappellaro, Alberto
id: 9d13b3cb-30a2-11eb-80dc-f772505e8660
last_name: Cappellaro
orcid: 0000-0001-6110-2359
- first_name: L.
full_name: Salasnich, L.
last_name: Salasnich
citation:
ama: 'Bighin G, Cappellaro A, Salasnich L. Unitary Fermi superfluid near the critical
temperature: Thermodynamics and sound modes from elementary excitations. Physical
Review A. 2022;105(6). doi:10.1103/PhysRevA.105.063329'
apa: 'Bighin, G., Cappellaro, A., & Salasnich, L. (2022). Unitary Fermi superfluid
near the critical temperature: Thermodynamics and sound modes from elementary
excitations. Physical Review A. American Physical Society. https://doi.org/10.1103/PhysRevA.105.063329'
chicago: 'Bighin, Giacomo, Alberto Cappellaro, and L. Salasnich. “Unitary Fermi
Superfluid near the Critical Temperature: Thermodynamics and Sound Modes from
Elementary Excitations.” Physical Review A. American Physical Society,
2022. https://doi.org/10.1103/PhysRevA.105.063329.'
ieee: 'G. Bighin, A. Cappellaro, and L. Salasnich, “Unitary Fermi superfluid near
the critical temperature: Thermodynamics and sound modes from elementary excitations,”
Physical Review A, vol. 105, no. 6. American Physical Society, 2022.'
ista: 'Bighin G, Cappellaro A, Salasnich L. 2022. Unitary Fermi superfluid near
the critical temperature: Thermodynamics and sound modes from elementary excitations.
Physical Review A. 105(6), 063329.'
mla: 'Bighin, Giacomo, et al. “Unitary Fermi Superfluid near the Critical Temperature:
Thermodynamics and Sound Modes from Elementary Excitations.” Physical Review
A, vol. 105, no. 6, 063329, American Physical Society, 2022, doi:10.1103/PhysRevA.105.063329.'
short: G. Bighin, A. Cappellaro, L. Salasnich, Physical Review A 105 (2022).
date_created: 2022-07-17T22:01:55Z
date_published: 2022-06-30T00:00:00Z
date_updated: 2023-08-03T12:00:11Z
day: '30'
department:
- _id: MiLe
doi: 10.1103/PhysRevA.105.063329
external_id:
arxiv:
- '2206.03924'
isi:
- '000829758500010'
intvolume: ' 105'
isi: 1
issue: '6'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: ' https://doi.org/10.48550/arXiv.2206.03924'
month: '06'
oa: 1
oa_version: Preprint
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Unitary Fermi superfluid near the critical temperature: Thermodynamics and
sound modes from elementary excitations'
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 105
year: '2022'
...
---
_id: '11998'
abstract:
- lang: eng
text: Recently it became possible to study highly excited rotational states of molecules
in superfluid helium through nonadiabatic alignment experiments (Cherepanov et
al 2021 Phys. Rev. A 104 L061303). This calls for theoretical approaches that
go beyond explaining renormalized values of molecular spectroscopic constants,
which suffices when only the lowest few rotational states are involved. As the
first step in this direction, here we present a basic quantum mechanical model
describing highly excited rotational states of molecules in superfluid helium
nanodroplets. We show that a linear molecule immersed in a superfluid can be seen
as an effective symmetric top, similar to the rotational structure of radicals,
such as OH or NO, but with the angular momentum of the superfluid playing the
role of the electronic angular momentum in free molecules. The simple theory sheds
light onto what happens when the rotational angular momentum of the molecule increases
beyond the lowest excited states accessible by infrared spectroscopy. In addition,
the model allows to estimate the effective rotational and centrifugal distortion
constants for a broad range of species and to explain the crossover between light
and heavy molecules in superfluid 4He in terms of the many-body wavefunction structure.
Some of the above mentioned insights can be acquired by analyzing a simple 2 ×
2 matrix.
acknowledgement: IC acknowledges the support by the European Union's Horizon 2020
research and innovation programme under the Marie Skłodowska-Curie Grant Agreement
No. 665385. GB acknowledges support from the Austrian Science Fund (FWF), under
Project No. M2461-N27 and from the Deutsche Forschungsgemeinschaft (DFG, German
Research Foundation) under Germany's Excellence Strategy EXC2181/1-390900948 (the
Heidelberg STRUCTURES Excellence Cluster). ML acknowledges support by the Austrian
Science Fund (FWF), under Project No. P29902-N27, and by the European Research Council
(ERC) starting Grant No. 801770 (ANGULON). HS acknowledges support from the Independent
Research Fund Denmark (Project No. 8021-00232B) and from the Villum Fonden through
a Villum Investigator Grant No. 25886.
article_number: '075004'
article_processing_charge: Yes
article_type: original
author:
- first_name: Igor
full_name: Cherepanov, Igor
id: 339C7E5A-F248-11E8-B48F-1D18A9856A87
last_name: Cherepanov
- first_name: Giacomo
full_name: Bighin, Giacomo
id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
last_name: Bighin
orcid: 0000-0001-8823-9777
- first_name: Constant A.
full_name: Schouder, Constant A.
last_name: Schouder
- first_name: Adam S.
full_name: Chatterley, Adam S.
last_name: Chatterley
- first_name: Henrik
full_name: Stapelfeldt, Henrik
last_name: Stapelfeldt
- first_name: Mikhail
full_name: Lemeshko, Mikhail
id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
last_name: Lemeshko
orcid: 0000-0002-6990-7802
citation:
ama: Cherepanov I, Bighin G, Schouder CA, Chatterley AS, Stapelfeldt H, Lemeshko
M. A simple model for high rotational excitations of molecules in a superfluid.
New Journal of Physics. 2022;24(7). doi:10.1088/1367-2630/ac8113
apa: Cherepanov, I., Bighin, G., Schouder, C. A., Chatterley, A. S., Stapelfeldt,
H., & Lemeshko, M. (2022). A simple model for high rotational excitations
of molecules in a superfluid. New Journal of Physics. IOP. https://doi.org/10.1088/1367-2630/ac8113
chicago: Cherepanov, Igor, Giacomo Bighin, Constant A. Schouder, Adam S. Chatterley,
Henrik Stapelfeldt, and Mikhail Lemeshko. “A Simple Model for High Rotational
Excitations of Molecules in a Superfluid.” New Journal of Physics. IOP,
2022. https://doi.org/10.1088/1367-2630/ac8113.
ieee: I. Cherepanov, G. Bighin, C. A. Schouder, A. S. Chatterley, H. Stapelfeldt,
and M. Lemeshko, “A simple model for high rotational excitations of molecules
in a superfluid,” New Journal of Physics, vol. 24, no. 7. IOP, 2022.
ista: Cherepanov I, Bighin G, Schouder CA, Chatterley AS, Stapelfeldt H, Lemeshko
M. 2022. A simple model for high rotational excitations of molecules in a superfluid.
New Journal of Physics. 24(7), 075004.
mla: Cherepanov, Igor, et al. “A Simple Model for High Rotational Excitations of
Molecules in a Superfluid.” New Journal of Physics, vol. 24, no. 7, 075004,
IOP, 2022, doi:10.1088/1367-2630/ac8113.
short: I. Cherepanov, G. Bighin, C.A. Schouder, A.S. Chatterley, H. Stapelfeldt,
M. Lemeshko, New Journal of Physics 24 (2022).
date_created: 2022-08-28T22:02:01Z
date_published: 2022-08-11T00:00:00Z
date_updated: 2023-08-03T13:19:06Z
day: '11'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.1088/1367-2630/ac8113
ec_funded: 1
external_id:
isi:
- '000839216900001'
file:
- access_level: open_access
checksum: 10116a08d3489befc13dba2cc44490f1
content_type: application/pdf
creator: alisjak
date_created: 2022-08-29T09:57:40Z
date_updated: 2022-08-29T09:57:40Z
file_id: '12005'
file_name: 2022_NewJournalofPhysics_Cherepanov.pdf
file_size: 1912882
relation: main_file
success: 1
file_date_updated: 2022-08-29T09:57:40Z
has_accepted_license: '1'
intvolume: ' 24'
isi: 1
issue: '7'
language:
- iso: eng
license: https://creativecommons.org/licenses/by/4.0/
month: '08'
oa: 1
oa_version: Published Version
project:
- _id: 2564DBCA-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '665385'
name: International IST Doctoral Program
- _id: 2688CF98-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '801770'
name: 'Angulon: physics and applications of a new quasiparticle'
- _id: 26986C82-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: M02641
name: A path-integral approach to composite impurities
publication: New Journal of Physics
publication_identifier:
issn:
- 1367-2630
publication_status: published
publisher: IOP
quality_controlled: '1'
scopus_import: '1'
status: public
title: A simple model for high rotational excitations of molecules in a superfluid
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: 24
year: '2022'
...
---
_id: '11997'
abstract:
- lang: eng
text: "We study the fate of an impurity in an ultracold heteronuclear Bose mixture,
focusing on the experimentally relevant case of a ⁴¹K - ⁸⁷Rb mixture, with the
impurity in a ⁴¹K hyperfine state. Our paper provides a comprehensive description
of an impurity in a BEC mixture with contact interactions across its phase diagram.
We present results for the miscible and immiscible regimes, as well as for the
impurity in a self-bound quantum droplet. Here, varying the interactions, we find
exotic states where the impurity localizes either at the center or\r\nat the surface
of the droplet. "
acknowledgement: We thank A. Simoni for providing the calculations of the intercomponent
scattering lengths. We gratefully acknowledge stimulating discussions with L. A.
Peña Ardila, R. Schmidt, H. Silva, V. Zampronio, and M. Prevedelli for careful reading.
G.B. acknowledges support from the Austrian Science Fund (FWF) under Project No.
M2641-N27. T.M. acknowledges CNPq for support through Bolsa de produtividade em
Pesquisa No. 311079/2015-6. This work is supported by the Deutsche Forschungsgemeinschaft
(DFG, German Research Foundation) under Germany's Excellence Strategy No. EXC2181/1-390900948
(the Heidelberg STRUCTURES Excellence Cluster). This work was supported by the Serrapilheira
Institute (Grant No. Serra-1812-27802). We thank the High-Performance Computing
Center (NPAD) at UFRN for providing computational resources.
article_number: '023301'
article_processing_charge: No
article_type: original
author:
- first_name: Giacomo
full_name: Bighin, Giacomo
id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
last_name: Bighin
orcid: 0000-0001-8823-9777
- first_name: A.
full_name: Burchianti, A.
last_name: Burchianti
- first_name: F.
full_name: Minardi, F.
last_name: Minardi
- first_name: T.
full_name: Macrì, T.
last_name: Macrì
citation:
ama: Bighin G, Burchianti A, Minardi F, Macrì T. Impurity in a heteronuclear two-component
Bose mixture. Physical Review A. 2022;106(2). doi:10.1103/PhysRevA.106.023301
apa: Bighin, G., Burchianti, A., Minardi, F., & Macrì, T. (2022). Impurity in
a heteronuclear two-component Bose mixture. Physical Review A. American
Physical Society. https://doi.org/10.1103/PhysRevA.106.023301
chicago: Bighin, Giacomo, A. Burchianti, F. Minardi, and T. Macrì. “Impurity in
a Heteronuclear Two-Component Bose Mixture.” Physical Review A. American
Physical Society, 2022. https://doi.org/10.1103/PhysRevA.106.023301.
ieee: G. Bighin, A. Burchianti, F. Minardi, and T. Macrì, “Impurity in a heteronuclear
two-component Bose mixture,” Physical Review A, vol. 106, no. 2. American
Physical Society, 2022.
ista: Bighin G, Burchianti A, Minardi F, Macrì T. 2022. Impurity in a heteronuclear
two-component Bose mixture. Physical Review A. 106(2), 023301.
mla: Bighin, Giacomo, et al. “Impurity in a Heteronuclear Two-Component Bose Mixture.”
Physical Review A, vol. 106, no. 2, 023301, American Physical Society,
2022, doi:10.1103/PhysRevA.106.023301.
short: G. Bighin, A. Burchianti, F. Minardi, T. Macrì, Physical Review A 106 (2022).
date_created: 2022-08-28T22:02:00Z
date_published: 2022-08-04T00:00:00Z
date_updated: 2023-08-03T13:20:42Z
day: '04'
department:
- _id: MiLe
doi: 10.1103/PhysRevA.106.023301
external_id:
arxiv:
- '2109.07451'
isi:
- '000837953600006'
intvolume: ' 106'
isi: 1
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.48550/arXiv.2109.07451
month: '08'
oa: 1
oa_version: Preprint
project:
- _id: 26986C82-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: M02641
name: A path-integral approach to composite impurities
publication: Physical Review A
publication_identifier:
eissn:
- 2469-9934
issn:
- 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Impurity in a heteronuclear two-component Bose mixture
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 106
year: '2022'
...
---
_id: '12139'
abstract:
- lang: eng
text: We demonstrate the formation of robust zero-energy modes close to magnetic
impurities in the iron-based superconductor FeSe1-z Tez. We find that the Zeeman
field generated by the impurity favors a spin-triplet interorbital pairing as
opposed to the spin-singlet intraorbital pairing prevalent in the bulk. The preferred
spin-triplet pairing preserves time-reversal symmetry and is topological, as robust,
topologically protected zero modes emerge at the boundary between regions with
different pairing states. Moreover, the zero modes form Kramers doublets that
are insensitive to the direction of the spin polarization or to the separation
between impurities. We argue that our theoretical results are consistent with
recent experimental measurements on FeSe1-z Tez.
acknowledgement: "We thank Armin Rahmani, Andrey V. Chubukov, Jay D. Sau and Ruixing
Zhang for fruitful discussions. AK and PG are supported by NSF-DMR2037996. PG also
acknowledges support from NSF-DMR1824265. RMF was supported by the U. S. Department
of Energy, Office\r\nof Science, Basic Energy Sciences, Materials Sciences and Engineering
Division, under Award No. DE-SC0020045. Part of this work was performed at the Aspen
Center for Physics, which is supported by National Science Foundation grant PHY-1607611. "
article_number: L201107
article_processing_charge: No
article_type: original
author:
- first_name: Areg
full_name: Ghazaryan, Areg
id: 4AF46FD6-F248-11E8-B48F-1D18A9856A87
last_name: Ghazaryan
orcid: 0000-0001-9666-3543
- first_name: Ammar
full_name: Kirmani, Ammar
last_name: Kirmani
- first_name: Rafael M.
full_name: Fernandes, Rafael M.
last_name: Fernandes
- first_name: Pouyan
full_name: Ghaemi, Pouyan
last_name: Ghaemi
citation:
ama: Ghazaryan A, Kirmani A, Fernandes RM, Ghaemi P. Anomalous Shiba states in topological
iron-based superconductors. Physical Review B. 2022;106(20). doi:10.1103/physrevb.106.l201107
apa: Ghazaryan, A., Kirmani, A., Fernandes, R. M., & Ghaemi, P. (2022). Anomalous
Shiba states in topological iron-based superconductors. Physical Review B.
American Physical Society. https://doi.org/10.1103/physrevb.106.l201107
chicago: Ghazaryan, Areg, Ammar Kirmani, Rafael M. Fernandes, and Pouyan Ghaemi.
“Anomalous Shiba States in Topological Iron-Based Superconductors.” Physical
Review B. American Physical Society, 2022. https://doi.org/10.1103/physrevb.106.l201107.
ieee: A. Ghazaryan, A. Kirmani, R. M. Fernandes, and P. Ghaemi, “Anomalous Shiba
states in topological iron-based superconductors,” Physical Review B, vol.
106, no. 20. American Physical Society, 2022.
ista: Ghazaryan A, Kirmani A, Fernandes RM, Ghaemi P. 2022. Anomalous Shiba states
in topological iron-based superconductors. Physical Review B. 106(20), L201107.
mla: Ghazaryan, Areg, et al. “Anomalous Shiba States in Topological Iron-Based Superconductors.”
Physical Review B, vol. 106, no. 20, L201107, American Physical Society,
2022, doi:10.1103/physrevb.106.l201107.
short: A. Ghazaryan, A. Kirmani, R.M. Fernandes, P. Ghaemi, Physical Review B 106
(2022).
date_created: 2023-01-12T12:04:43Z
date_published: 2022-11-15T00:00:00Z
date_updated: 2023-08-04T08:55:31Z
day: '15'
department:
- _id: MiLe
doi: 10.1103/physrevb.106.l201107
external_id:
arxiv:
- '2207.12425'
isi:
- '000893171800001'
intvolume: ' 106'
isi: 1
issue: '20'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: ' https://doi.org/10.48550/arXiv.2207.12425'
month: '11'
oa: 1
oa_version: Preprint
publication: Physical Review B
publication_identifier:
eissn:
- 2469-9969
issn:
- 2469-9950
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Anomalous Shiba states in topological iron-based superconductors
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 106
year: '2022'
...
---
_id: '12150'
abstract:
- lang: eng
text: Methods inspired from machine learning have recently attracted great interest
in the computational study of quantum many-particle systems. So far, however,
it has proven challenging to deal with microscopic models in which the total number
of particles is not conserved. To address this issue, we propose a variant of
neural network states, which we term neural coherent states. Taking the Fröhlich
impurity model as a case study, we show that neural coherent states can learn
the ground state of nonadditive systems very well. In particular, we recover exact
diagonalization in all regimes tested and observe substantial improvement over
the standard coherent state estimates in the most challenging intermediate-coupling
regime. Our approach is generic and does not assume specific details of the system,
suggesting wide applications.
acknowledgement: 'We acknowledge fruitful discussions with G. Bighin, G. Fabiani,
A. Ghazaryan, C. Lampert, and A. Volosniev at various stages of this work. W.R.
acknowledges support through a DOC Fellowship of the Austrian Academy of Sciences
and has received funding from the EU Horizon 2020 programme under the Marie Skłodowska-Curie
Grant Agreement No. 665385. M.L. and J.H.M. acknowledge support by the European
Research Council (ERC) Starting Grant No. 801770 (ANGULON) and Synergy Grant No.
856538 (3D-MAGiC), respectively. This work is part of the Shell-NWO/FOMinitiative
“Computational sciences for energy research” of Shell and Chemical Sciences, Earth
and Life Sciences, Physical Sciences, FOM and STW. '
article_number: '155127'
article_processing_charge: No
article_type: original
author:
- first_name: Wojciech
full_name: Rzadkowski, Wojciech
id: 48C55298-F248-11E8-B48F-1D18A9856A87
last_name: Rzadkowski
orcid: 0000-0002-1106-4419
- first_name: Mikhail
full_name: Lemeshko, Mikhail
id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
last_name: Lemeshko
orcid: 0000-0002-6990-7802
- first_name: Johan H.
full_name: Mentink, Johan H.
last_name: Mentink
citation:
ama: Rzadkowski W, Lemeshko M, Mentink JH. Artificial neural network states for
nonadditive systems. Physical Review B. 2022;106(15). doi:10.1103/physrevb.106.155127
apa: Rzadkowski, W., Lemeshko, M., & Mentink, J. H. (2022). Artificial neural
network states for nonadditive systems. Physical Review B. American Physical
Society. https://doi.org/10.1103/physrevb.106.155127
chicago: Rzadkowski, Wojciech, Mikhail Lemeshko, and Johan H. Mentink. “Artificial
Neural Network States for Nonadditive Systems.” Physical Review B. American
Physical Society, 2022. https://doi.org/10.1103/physrevb.106.155127.
ieee: W. Rzadkowski, M. Lemeshko, and J. H. Mentink, “Artificial neural network
states for nonadditive systems,” Physical Review B, vol. 106, no. 15. American
Physical Society, 2022.
ista: Rzadkowski W, Lemeshko M, Mentink JH. 2022. Artificial neural network states
for nonadditive systems. Physical Review B. 106(15), 155127.
mla: Rzadkowski, Wojciech, et al. “Artificial Neural Network States for Nonadditive
Systems.” Physical Review B, vol. 106, no. 15, 155127, American Physical
Society, 2022, doi:10.1103/physrevb.106.155127.
short: W. Rzadkowski, M. Lemeshko, J.H. Mentink, Physical Review B 106 (2022).
date_created: 2023-01-12T12:07:49Z
date_published: 2022-10-15T00:00:00Z
date_updated: 2023-08-04T09:01:48Z
day: '15'
department:
- _id: MiLe
doi: 10.1103/physrevb.106.155127
ec_funded: 1
external_id:
arxiv:
- '2105.15193'
isi:
- '000875189100005'
intvolume: ' 106'
isi: 1
issue: '15'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: ' https://doi.org/10.48550/arXiv.2105.15193'
month: '10'
oa: 1
oa_version: Preprint
project:
- _id: 05A235A0-7A3F-11EA-A408-12923DDC885E
grant_number: '25681'
name: Analytic and machine learning approaches to composite quantum impurities
- _id: 2564DBCA-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '665385'
name: International IST Doctoral Program
- _id: 2688CF98-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '801770'
name: 'Angulon: physics and applications of a new quasiparticle'
publication: Physical Review B
publication_identifier:
eissn:
- 2469-9969
issn:
- 2469-9950
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Artificial neural network states for nonadditive systems
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 106
year: '2022'
...