[{"date_published":"2023-01-10T00:00:00Z","doi":"10.1017/jfm.2022.1001","date_created":"2023-01-08T23:00:53Z","day":"10","publication":"Journal of Fluid Mechanics","has_accepted_license":"1","isi":1,"year":"2023","quality_controlled":"1","publisher":"Cambridge University Press","oa":1,"acknowledgement":"E.M. acknowledges funding from the ISTplus fellowship programme. G.Y. and B.H. acknowledge\r\na grant from the Simons Foundation (662960, BH).","title":"Symmetry-reduced dynamic mode decomposition of near-wall turbulence","author":[{"first_name":"Elena","id":"0BE7553A-1004-11EA-B805-18983DDC885E","full_name":"Marensi, Elena","last_name":"Marensi"},{"last_name":"Yalniz","full_name":"Yalniz, Gökhan","orcid":"0000-0002-8490-9312","id":"66E74FA2-D8BF-11E9-8249-8DE2E5697425","first_name":"Gökhan"},{"id":"3A374330-F248-11E8-B48F-1D18A9856A87","first_name":"Björn","last_name":"Hof","orcid":"0000-0003-2057-2754","full_name":"Hof, Björn"},{"id":"3EA1010E-F248-11E8-B48F-1D18A9856A87","first_name":"Nazmi B","last_name":"Budanur","full_name":"Budanur, Nazmi B","orcid":"0000-0003-0423-5010"}],"external_id":{"arxiv":["2101.07516"],"isi":["000903336600001"]},"article_processing_charge":"Yes (via OA deal)","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","citation":{"mla":"Marensi, Elena, et al. “Symmetry-Reduced Dynamic Mode Decomposition of near-Wall Turbulence.” Journal of Fluid Mechanics, vol. 954, A10, Cambridge University Press, 2023, doi:10.1017/jfm.2022.1001.","short":"E. Marensi, G. Yalniz, B. Hof, N.B. Budanur, Journal of Fluid Mechanics 954 (2023).","ieee":"E. Marensi, G. Yalniz, B. Hof, and N. B. Budanur, “Symmetry-reduced dynamic mode decomposition of near-wall turbulence,” Journal of Fluid Mechanics, vol. 954. Cambridge University Press, 2023.","apa":"Marensi, E., Yalniz, G., Hof, B., & Budanur, N. B. (2023). Symmetry-reduced dynamic mode decomposition of near-wall turbulence. Journal of Fluid Mechanics. Cambridge University Press. https://doi.org/10.1017/jfm.2022.1001","ama":"Marensi E, Yalniz G, Hof B, Budanur NB. Symmetry-reduced dynamic mode decomposition of near-wall turbulence. Journal of Fluid Mechanics. 2023;954. doi:10.1017/jfm.2022.1001","chicago":"Marensi, Elena, Gökhan Yalniz, Björn Hof, and Nazmi B Budanur. “Symmetry-Reduced Dynamic Mode Decomposition of near-Wall Turbulence.” Journal of Fluid Mechanics. Cambridge University Press, 2023. https://doi.org/10.1017/jfm.2022.1001.","ista":"Marensi E, Yalniz G, Hof B, Budanur NB. 2023. Symmetry-reduced dynamic mode decomposition of near-wall turbulence. Journal of Fluid Mechanics. 954, A10."},"project":[{"name":"Revisiting the Turbulence Problem Using Statistical Mechanics: Experimental Studies on Transitional and Turbulent Flows","grant_number":"662960","_id":"238598C6-32DE-11EA-91FC-C7463DDC885E"}],"article_number":"A10","volume":954,"file":[{"file_size":1931647,"date_updated":"2023-02-02T12:34:54Z","creator":"dernst","file_name":"2023_JourFluidMechanics_Marensi.pdf","date_created":"2023-02-02T12:34:54Z","content_type":"application/pdf","relation":"main_file","access_level":"open_access","success":1,"file_id":"12489","checksum":"9224f987caefe5dd85a70814d3cce65c"}],"language":[{"iso":"eng"}],"publication_identifier":{"issn":["0022-1120"],"eissn":["1469-7645"]},"publication_status":"published","month":"01","intvolume":" 954","scopus_import":"1","oa_version":"Published Version","abstract":[{"text":"Data-driven dimensionality reduction methods such as proper orthogonal decomposition and dynamic mode decomposition have proven to be useful for exploring complex phenomena within fluid dynamics and beyond. A well-known challenge for these techniques is posed by the continuous symmetries, e.g. translations and rotations, of the system under consideration, as drifts in the data dominate the modal expansions without providing an insight into the dynamics of the problem. In the present study, we address this issue for fluid flows in rectangular channels by formulating a continuous symmetry reduction method that eliminates the translations in the streamwise and spanwise directions simultaneously. We demonstrate our method by computing the symmetry-reduced dynamic mode decomposition (SRDMD) of sliding windows of data obtained from the transitional plane-Couette and turbulent plane-Poiseuille flow simulations. In the former setting, SRDMD captures the dynamics in the vicinity of the invariant solutions with translation symmetries, i.e. travelling waves and relative periodic orbits, whereas in the latter, our calculations reveal episodes of turbulent time evolution that can be approximated by a low-dimensional linear expansion.","lang":"eng"}],"file_date_updated":"2023-02-02T12:34:54Z","department":[{"_id":"BjHo"}],"ddc":["530"],"date_updated":"2023-08-01T12:53:23Z","status":"public","article_type":"original","type":"journal_article","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"_id":"12105"},{"_id":"14466","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"article_type":"original","type":"journal_article","keyword":["turbulence","transition to turbulence","patterns"],"status":"public","date_updated":"2024-02-15T09:06:23Z","ddc":["530"],"file_date_updated":"2024-02-15T09:05:21Z","department":[{"_id":"GradSch"},{"_id":"BjHo"}],"abstract":[{"text":"The first long-lived turbulent structures observable in planar shear flows take the form of localized stripes, inclined with respect to the mean flow direction. The dynamics of these stripes is central to transition, and recent studies proposed an analogy to directed percolation where the stripes’ proliferation is ultimately responsible for the turbulence becoming sustained. In the present study we focus on the internal stripe dynamics as well as on the eventual stripe expansion, and we compare the underlying mechanisms in pressure- and shear-driven planar flows, respectively, plane-Poiseuille and plane-Couette flow. Despite the similarities of the overall laminar–turbulence patterns, the stripe proliferation processes in the two cases are fundamentally different. Starting from the growth and sustenance of individual stripes, we find that in plane-Couette flow new streaks are created stochastically throughout the stripe whereas in plane-Poiseuille flow streak creation is deterministic and occurs locally at the downstream tip. Because of the up/downstream symmetry, Couette stripes, in contrast to Poiseuille stripes, have two weak and two strong laminar turbulent interfaces. These differences in symmetry as well as in internal growth give rise to two fundamentally different stripe splitting mechanisms. In plane-Poiseuille flow splitting is connected to the elongational growth of the original stripe, and it results from a break-off/shedding of the stripe's tail. In plane-Couette flow splitting follows from a broadening of the original stripe and a division along the stripe into two slimmer stripes.","lang":"eng"}],"oa_version":"Published Version","intvolume":" 974","month":"11","publication_status":"published","publication_identifier":{"eissn":["1469-7645"],"issn":["0022-1120"]},"language":[{"iso":"eng"}],"file":[{"creator":"dernst","file_size":2804641,"date_updated":"2024-02-15T09:05:21Z","file_name":"2023_JourFluidMechanics_Marensi.pdf","date_created":"2024-02-15T09:05:21Z","relation":"main_file","access_level":"open_access","content_type":"application/pdf","success":1,"checksum":"17c64c1fb0d5f73252364bf98b0b9e1a","file_id":"14996"}],"volume":974,"article_number":"A21","project":[{"grant_number":"662960","name":"Revisiting the Turbulence Problem Using Statistical Mechanics: Experimental Studies on Transitional and Turbulent Flows","_id":"238598C6-32DE-11EA-91FC-C7463DDC885E"}],"citation":{"mla":"Marensi, Elena, et al. “Dynamics and Proliferation of Turbulent Stripes in Plane-Poiseuille and Plane-Couette Flows.” Journal of Fluid Mechanics, vol. 974, A21, Cambridge University Press, 2023, doi:10.1017/jfm.2023.780.","apa":"Marensi, E., Yalniz, G., & Hof, B. (2023). Dynamics and proliferation of turbulent stripes in plane-Poiseuille and plane-Couette flows. Journal of Fluid Mechanics. Cambridge University Press. https://doi.org/10.1017/jfm.2023.780","ama":"Marensi E, Yalniz G, Hof B. Dynamics and proliferation of turbulent stripes in plane-Poiseuille and plane-Couette flows. Journal of Fluid Mechanics. 2023;974. doi:10.1017/jfm.2023.780","ieee":"E. Marensi, G. Yalniz, and B. Hof, “Dynamics and proliferation of turbulent stripes in plane-Poiseuille and plane-Couette flows,” Journal of Fluid Mechanics, vol. 974. Cambridge University Press, 2023.","short":"E. Marensi, G. Yalniz, B. Hof, Journal of Fluid Mechanics 974 (2023).","chicago":"Marensi, Elena, Gökhan Yalniz, and Björn Hof. “Dynamics and Proliferation of Turbulent Stripes in Plane-Poiseuille and Plane-Couette Flows.” Journal of Fluid Mechanics. Cambridge University Press, 2023. https://doi.org/10.1017/jfm.2023.780.","ista":"Marensi E, Yalniz G, Hof B. 2023. Dynamics and proliferation of turbulent stripes in plane-Poiseuille and plane-Couette flows. Journal of Fluid Mechanics. 974, A21."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_processing_charge":"Yes (via OA deal)","external_id":{"arxiv":["2212.12406"],"isi":["001088363700001"]},"author":[{"first_name":"Elena","id":"0BE7553A-1004-11EA-B805-18983DDC885E","last_name":"Marensi","full_name":"Marensi, Elena","orcid":"0000-0001-7173-4923"},{"last_name":"Yalniz","orcid":"0000-0002-8490-9312","full_name":"Yalniz, Gökhan","first_name":"Gökhan","id":"66E74FA2-D8BF-11E9-8249-8DE2E5697425"},{"full_name":"Hof, Björn","orcid":"0000-0003-2057-2754","last_name":"Hof","id":"3A374330-F248-11E8-B48F-1D18A9856A87","first_name":"Björn"}],"title":"Dynamics and proliferation of turbulent stripes in plane-Poiseuille and plane-Couette flows","acknowledgement":"E.M. acknowledges funding from the ISTplus fellowship programme. G.Y. and B.H. acknowledge a grant from the Simons Foundation (662960, BH).","oa":1,"quality_controlled":"1","publisher":"Cambridge University Press","year":"2023","has_accepted_license":"1","isi":1,"publication":"Journal of Fluid Mechanics","day":"10","date_created":"2023-10-30T09:32:28Z","doi":"10.1017/jfm.2023.780","date_published":"2023-11-10T00:00:00Z"},{"type":"book_chapter","conference":{"location":"London, United Kingdom","end_date":"2019-09-06","start_date":"2019-09-02","name":"IUTAM Symposium"},"status":"public","series_title":"IUTAM Bookseries","_id":"10820","department":[{"_id":"BjHo"}],"date_updated":"2023-08-03T12:54:59Z","scopus_import":"1","month":"01","place":"Cham","intvolume":" 38","abstract":[{"lang":"eng","text":"Streaky structures in the boundary layers are often generated by surface roughness elements and/or free-stream turbulence, and are known to have significant effects on boundary-layer instability. In this paper, we investigate the impact of two forms of streaks on the instability of supersonic boundary layers. The first concerns the streaks generated by an array of spanwise periodic and streamwise elongated surface roughness elements, and our interest is how these streaks influence the lower-branch viscous first modes, whose characteristic wavelength and frequency are on the classical triple-deck scales. By adapting the triple-deck theory in the incompressible regime to the supersonic one, we first derived a simplified system which allows for efficient calculation of the streaks. The asymptotic analysis simplifies a bi-global eigenvalue problem to a one-dimensional problem in the spanwise direction, showing that the instability is controlled at leading order solely by the spanwise-dependent wall shear. In the fundamental configuration, the streaks stabilize first modes at low frequencies but destabilize the high-frequency ones. In the subharmonic configuration, the streaks generally destabilize the first mode across the entire frequency band. Importantly, the spanwise even modes are of radiating nature, i.e. they emit acoustic waves spontaneously to the far field. Streaks of the second form are generated by low-frequency vortical disturbances representing free-stream turbulence. They alter the flow in the entire layer and their effects on instability are investigated by solving the inviscid bi-global eigenvalue problem. Different from the incompressible case, a multitude of compressible instability modes exists, of which the dominant mode is an inviscid instability associated with the spanwise shear. In addition, there exists a separate branch of instability modes that have smaller growth rates but are spontaneously radiating."}],"oa_version":"None","volume":38,"publication_identifier":{"eisbn":["9783030679026"],"isbn":["9783030679019"],"eissn":["1875-3493"],"issn":["1875-3507"]},"publication_status":"published","language":[{"iso":"eng"}],"author":[{"full_name":"Liu, Jianxin","last_name":"Liu","first_name":"Jianxin"},{"full_name":"Marensi, Elena","last_name":"Marensi","first_name":"Elena","id":"0BE7553A-1004-11EA-B805-18983DDC885E"},{"first_name":"Xuesong","last_name":"Wu","full_name":"Wu, Xuesong"}],"article_processing_charge":"No","external_id":{"isi":["000709087600051"]},"editor":[{"first_name":"Spencer","full_name":"Sherwin, Spencer","last_name":"Sherwin"},{"full_name":"Schmid, Peter","last_name":"Schmid","first_name":"Peter"},{"last_name":"Wu","full_name":"Wu, Xuesong","first_name":"Xuesong"}],"title":"Effects of streaky structures on the instability of supersonic boundary layers","citation":{"ieee":"J. Liu, E. Marensi, and X. Wu, “Effects of streaky structures on the instability of supersonic boundary layers,” in IUTAM Laminar-Turbulent Transition, 1st ed., vol. 38, S. Sherwin, P. Schmid, and X. Wu, Eds. Cham: Springer Nature, 2022, pp. 587–598.","short":"J. Liu, E. Marensi, X. Wu, in:, S. Sherwin, P. Schmid, X. Wu (Eds.), IUTAM Laminar-Turbulent Transition, 1st ed., Springer Nature, Cham, 2022, pp. 587–598.","ama":"Liu J, Marensi E, Wu X. Effects of streaky structures on the instability of supersonic boundary layers. In: Sherwin S, Schmid P, Wu X, eds. IUTAM Laminar-Turbulent Transition. Vol 38. 1st ed. IUTAM Bookseries. Cham: Springer Nature; 2022:587-598. doi:10.1007/978-3-030-67902-6_51","apa":"Liu, J., Marensi, E., & Wu, X. (2022). Effects of streaky structures on the instability of supersonic boundary layers. In S. Sherwin, P. Schmid, & X. Wu (Eds.), IUTAM Laminar-Turbulent Transition (1st ed., Vol. 38, pp. 587–598). Cham: Springer Nature. https://doi.org/10.1007/978-3-030-67902-6_51","mla":"Liu, Jianxin, et al. “Effects of Streaky Structures on the Instability of Supersonic Boundary Layers.” IUTAM Laminar-Turbulent Transition, edited by Spencer Sherwin et al., 1st ed., vol. 38, Springer Nature, 2022, pp. 587–98, doi:10.1007/978-3-030-67902-6_51.","ista":"Liu J, Marensi E, Wu X. 2022.Effects of streaky structures on the instability of supersonic boundary layers. In: IUTAM Laminar-Turbulent Transition. vol. 38, 587–598.","chicago":"Liu, Jianxin, Elena Marensi, and Xuesong Wu. “Effects of Streaky Structures on the Instability of Supersonic Boundary Layers.” In IUTAM Laminar-Turbulent Transition, edited by Spencer Sherwin, Peter Schmid, and Xuesong Wu, 1st ed., 38:587–98. IUTAM Bookseries. Cham: Springer Nature, 2022. https://doi.org/10.1007/978-3-030-67902-6_51."},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","quality_controlled":"1","publisher":"Springer Nature","edition":"1","acknowledgement":"The work is supported by the National Key Research and Development Program of China (No. 2016YFA0401200), the National Natural Science Foundation of China (Grant Nos. 91952202 and 11402167).","page":"587-598","date_published":"2022-01-01T00:00:00Z","doi":"10.1007/978-3-030-67902-6_51","date_created":"2022-03-04T09:14:34Z","isi":1,"year":"2022","day":"01","publication":"IUTAM Laminar-Turbulent Transition"},{"date_updated":"2023-08-08T13:58:41Z","ddc":["530"],"department":[{"_id":"BjHo"}],"file_date_updated":"2021-08-03T09:53:28Z","_id":"9467","article_type":"original","type":"journal_article","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"status":"public","publication_identifier":{"eissn":["14697645"],"issn":["00221120"]},"publication_status":"published","file":[{"file_name":"2021_JournalFluidMechanics_Marensi.pdf","date_created":"2021-08-03T09:53:28Z","file_size":4087358,"date_updated":"2021-08-03T09:53:28Z","creator":"kschuh","success":1,"checksum":"867ad077e45c181c2c5ec1311ba27c41","file_id":"9766","content_type":"application/pdf","relation":"main_file","access_level":"open_access"}],"language":[{"iso":"eng"}],"volume":919,"abstract":[{"text":"Turbulence in the flow of fluid through a pipe can be suppressed by buoyancy forces. As the suppression of turbulence leads to severe heat transfer deterioration, this is an important and undesirable phenomenon in both heating and cooling applications. Vertical flow is often considered, as the axial buoyancy force can help drive the flow. With heating measured by the buoyancy parameter 𝐶, our direct numerical simulations show that shear-driven turbulence may either be completely laminarised or it transitions to a relatively quiescent convection-driven state. Buoyancy forces cause a flattening of the base flow profile, which in isothermal pipe flow has recently been linked to complete suppression of turbulence (Kühnen et al., Nat. Phys., vol. 14, 2018, pp. 386–390), and the flattened laminar base profile has enhanced nonlinear stability (Marensi et al., J. Fluid Mech., vol. 863, 2019, pp. 50–875). In agreement with these findings, the nonlinear lower-branch travelling-wave solution analysed here, which is believed to mediate transition to turbulence in isothermal pipe flow, is shown to be suppressed by buoyancy. A linear instability of the laminar base flow is responsible for the appearance of the relatively quiescent convection driven state for 𝐶≳4 across the range of Reynolds numbers considered. In the suppression of turbulence, however, i.e. in the transition from turbulence, we find clearer association with the analysis of He et al. (J. Fluid Mech., vol. 809, 2016, pp. 31–71) than with the above dynamical systems approach, which describes better the transition to turbulence. The laminarisation criterion He et al. propose, based on an apparent Reynolds number of the flow as measured by its driving pressure gradient, is found to capture the critical 𝐶=𝐶𝑐𝑟(𝑅𝑒) above which the flow will be laminarised or switch to the convection-driven type. Our analysis suggests that it is the weakened rolls, rather than the streaks, which appear to be critical for laminarisation.","lang":"eng"}],"oa_version":"Published Version","scopus_import":"1","month":"07","intvolume":" 919","citation":{"chicago":"Marensi, Elena, Shuisheng He, and Ashley P. Willis. “Suppression of Turbulence and Travelling Waves in a Vertical Heated Pipe.” Journal of Fluid Mechanics. Cambridge University Press, 2021. https://doi.org/10.1017/jfm.2021.371.","ista":"Marensi E, He S, Willis AP. 2021. Suppression of turbulence and travelling waves in a vertical heated pipe. Journal of Fluid Mechanics. 919, A17.","mla":"Marensi, Elena, et al. “Suppression of Turbulence and Travelling Waves in a Vertical Heated Pipe.” Journal of Fluid Mechanics, vol. 919, A17, Cambridge University Press, 2021, doi:10.1017/jfm.2021.371.","apa":"Marensi, E., He, S., & Willis, A. P. (2021). Suppression of turbulence and travelling waves in a vertical heated pipe. Journal of Fluid Mechanics. Cambridge University Press. https://doi.org/10.1017/jfm.2021.371","ama":"Marensi E, He S, Willis AP. Suppression of turbulence and travelling waves in a vertical heated pipe. Journal of Fluid Mechanics. 2021;919. doi:10.1017/jfm.2021.371","short":"E. Marensi, S. He, A.P. Willis, Journal of Fluid Mechanics 919 (2021).","ieee":"E. Marensi, S. He, and A. P. Willis, “Suppression of turbulence and travelling waves in a vertical heated pipe,” Journal of Fluid Mechanics, vol. 919. Cambridge University Press, 2021."},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","author":[{"first_name":"Elena","id":"0BE7553A-1004-11EA-B805-18983DDC885E","last_name":"Marensi","full_name":"Marensi, Elena"},{"last_name":"He","full_name":"He, Shuisheng","first_name":"Shuisheng"},{"first_name":"Ashley P.","full_name":"Willis, Ashley P.","last_name":"Willis"}],"article_processing_charge":"Yes (via OA deal)","external_id":{"arxiv":["2008.13486"],"isi":["000653785000001"]},"title":"Suppression of turbulence and travelling waves in a vertical heated pipe","article_number":"A17","has_accepted_license":"1","isi":1,"year":"2021","day":"25","publication":"Journal of Fluid Mechanics","doi":"10.1017/jfm.2021.371","date_published":"2021-07-25T00:00:00Z","date_created":"2021-06-06T22:01:30Z","acknowledgement":"The anonymous referees are kindly acknowledged for their useful suggestions andcomments.","quality_controlled":"1","publisher":"Cambridge University Press","oa":1},{"date_created":"2021-10-31T23:01:30Z","date_published":"2021-10-18T00:00:00Z","doi":"10.1038/s41467-021-26262-3","year":"2021","has_accepted_license":"1","isi":1,"publication":"Nature Communications","day":"18","oa":1,"quality_controlled":"1","publisher":"Springer Nature","acknowledgement":"L.S., P.G.Z., and A.I.T. thank the financial support of the European Graphene Flagship Project under grant agreements 881603 and EPSRC grant EP/S030751/1. L.S. and A.I.T. thank the European Union’s Horizon 2020 research and innovation programme under ITN Spin-NANO Marie Sklodowska-Curie grant agreement no. 676108. P.G.Z. and A.I.T. thank the European Union’s Horizon 2020 research and innovation programme under ITN 4PHOTON Marie Sklodowska-Curie grant agreement no. 721394. J.C., S.A.M., and R.S. acknowledge funding by EPSRC (EP/P033369 and EP/M013812). C.L.P., A.J.B., A.I.T., and A.M.F. acknowledge funding by EPSRC Programme Grant EP/N031776/1. S.A.M. acknowledges the Lee-Lucas Chair in Physics, the Solar Energies go Hybrid (SolTech) programme, and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy - EXC 2089/1 - 390776260.","external_id":{"arxiv":["2103.16986"],"isi":["000708601800015"]},"article_processing_charge":"No","author":[{"full_name":"Sortino, Luca","last_name":"Sortino","first_name":"Luca"},{"first_name":"Panaiot G.","full_name":"Zotev, Panaiot G.","last_name":"Zotev"},{"full_name":"Phillips, Catherine L.","last_name":"Phillips","first_name":"Catherine L."},{"first_name":"Alistair J.","last_name":"Brash","full_name":"Brash, Alistair J."},{"full_name":"Cambiasso, Javier","last_name":"Cambiasso","first_name":"Javier"},{"first_name":"Elena","id":"0BE7553A-1004-11EA-B805-18983DDC885E","full_name":"Marensi, Elena","orcid":"0000-0001-7173-4923","last_name":"Marensi"},{"first_name":"A. Mark","full_name":"Fox, A. Mark","last_name":"Fox"},{"first_name":"Stefan A.","last_name":"Maier","full_name":"Maier, Stefan A."},{"first_name":"Riccardo","full_name":"Sapienza, Riccardo","last_name":"Sapienza"},{"last_name":"Tartakovskii","full_name":"Tartakovskii, Alexander I.","first_name":"Alexander I."}],"title":"Bright single photon emitters with enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas","citation":{"mla":"Sortino, Luca, et al. “Bright Single Photon Emitters with Enhanced Quantum Efficiency in a Two-Dimensional Semiconductor Coupled with Dielectric Nano-Antennas.” Nature Communications, vol. 12, 6063, Springer Nature, 2021, doi:10.1038/s41467-021-26262-3.","ieee":"L. Sortino et al., “Bright single photon emitters with enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas,” Nature Communications, vol. 12. Springer Nature, 2021.","short":"L. Sortino, P.G. Zotev, C.L. Phillips, A.J. Brash, J. Cambiasso, E. Marensi, A.M. Fox, S.A. Maier, R. Sapienza, A.I. Tartakovskii, Nature Communications 12 (2021).","apa":"Sortino, L., Zotev, P. G., Phillips, C. L., Brash, A. J., Cambiasso, J., Marensi, E., … Tartakovskii, A. I. (2021). Bright single photon emitters with enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas. Nature Communications. Springer Nature. https://doi.org/10.1038/s41467-021-26262-3","ama":"Sortino L, Zotev PG, Phillips CL, et al. Bright single photon emitters with enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas. Nature Communications. 2021;12. doi:10.1038/s41467-021-26262-3","chicago":"Sortino, Luca, Panaiot G. Zotev, Catherine L. Phillips, Alistair J. Brash, Javier Cambiasso, Elena Marensi, A. Mark Fox, Stefan A. Maier, Riccardo Sapienza, and Alexander I. Tartakovskii. “Bright Single Photon Emitters with Enhanced Quantum Efficiency in a Two-Dimensional Semiconductor Coupled with Dielectric Nano-Antennas.” Nature Communications. Springer Nature, 2021. https://doi.org/10.1038/s41467-021-26262-3.","ista":"Sortino L, Zotev PG, Phillips CL, Brash AJ, Cambiasso J, Marensi E, Fox AM, Maier SA, Sapienza R, Tartakovskii AI. 2021. Bright single photon emitters with enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas. Nature Communications. 12, 6063."},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","article_number":"6063","volume":12,"publication_status":"published","publication_identifier":{"eissn":["2041-1723"]},"language":[{"iso":"eng"}],"file":[{"file_id":"10212","checksum":"8580d128389860f732028c521cd5949e","success":1,"content_type":"application/pdf","access_level":"open_access","relation":"main_file","date_created":"2021-11-03T11:31:24Z","file_name":"2021_NatComm_Sortino.pdf","date_updated":"2021-11-03T11:31:24Z","file_size":1434201,"creator":"cchlebak"}],"scopus_import":"1","intvolume":" 12","month":"10","abstract":[{"lang":"eng","text":"Single photon emitters in atomically-thin semiconductors can be deterministically positioned using strain induced by underlying nano-structures. Here, we couple monolayer WSe2 to high-refractive-index gallium phosphide dielectric nano-antennas providing both optical enhancement and monolayer deformation. For single photon emitters formed on such nano-antennas, we find very low (femto-Joule) saturation pulse energies and up to 104 times brighter photoluminescence than in WSe2 placed on low-refractive-index SiO2 pillars. We show that the key to these observations is the increase on average by a factor of 5 of the quantum efficiency of the emitters coupled to the nano-antennas. This further allows us to gain new insights into their photoluminescence dynamics, revealing the roles of the dark exciton reservoir and Auger processes. We also find that the coherence time of such emitters is limited by intrinsic dephasing processes. Our work establishes dielectric nano-antennas as a platform for high-efficiency quantum light generation in monolayer semiconductors."}],"oa_version":"Published Version","department":[{"_id":"BjHo"}],"file_date_updated":"2021-11-03T11:31:24Z","date_updated":"2023-08-14T08:12:12Z","ddc":["530"],"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"article_type":"original","type":"journal_article","status":"public","_id":"10203"}]