Superballistic flow of viscous electron fluid through graphene constrictions
Electron-electron (e-e) collisions can impact transport in a variety of surprising and sometimes counterintuitive ways. Despite strong interest, experiments on the subject proved challenging because of the simultaneous presence of different scattering mechanisms that suppress or obscure consequences...
| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Article |
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Springer Nature
2019
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| Online Access: | https://hdl.handle.net/1721.1/121330 |
| _version_ | 1826213542365233152 |
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| author | Krishna Kumar, R. Bandurin, D. A. Pellegrino, F. M. D. Cao, Y. Principi, A. Guo, Haoyu Auton, G. H. Ben Shalom, M. Ponomarenko, L. A. Falkovich, G. Watanabe, K. Taniguchi, T. Grigorieva, I. V. Levitov, Leonid Polini, M. Geim, A. K. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Krishna Kumar, R. Bandurin, D. A. Pellegrino, F. M. D. Cao, Y. Principi, A. Guo, Haoyu Auton, G. H. Ben Shalom, M. Ponomarenko, L. A. Falkovich, G. Watanabe, K. Taniguchi, T. Grigorieva, I. V. Levitov, Leonid Polini, M. Geim, A. K. |
| author_sort | Krishna Kumar, R. |
| collection | MIT |
| description | Electron-electron (e-e) collisions can impact transport in a variety of surprising and sometimes counterintuitive ways. Despite strong interest, experiments on the subject proved challenging because of the simultaneous presence of different scattering mechanisms that suppress or obscure consequences of e-e scattering. Only recently, sufficiently clean electron systems with transport dominated by e-e collisions have become available, showing behaviour characteristic of highly viscous fluids. Here we study electron transport through graphene constrictions and show that their conductance below 150 K increases with increasing temperature, in stark contrast to the metallic character of doped graphene. Notably, the measured conductance exceeds the maximum conductance possible for free electrons. This anomalous behaviour is attributed to collective movement of interacting electrons, which € shields' individual carriers from momentum loss at sample boundaries. The measurements allow us to identify the conductance contribution arising due to electron viscosity and determine its temperature dependence. Besides fundamental interest, our work shows that viscous effects can facilitate high-mobility transport at elevated temperatures, a potentially useful behaviour for designing graphene-based devices. |
| first_indexed | 2024-09-23T15:50:56Z |
| format | Article |
| id | mit-1721.1/121330 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T15:50:56Z |
| publishDate | 2019 |
| publisher | Springer Nature |
| record_format | dspace |
| spelling | mit-1721.1/1213302022-09-29T16:32:57Z Superballistic flow of viscous electron fluid through graphene constrictions Krishna Kumar, R. Bandurin, D. A. Pellegrino, F. M. D. Cao, Y. Principi, A. Guo, Haoyu Auton, G. H. Ben Shalom, M. Ponomarenko, L. A. Falkovich, G. Watanabe, K. Taniguchi, T. Grigorieva, I. V. Levitov, Leonid Polini, M. Geim, A. K. Massachusetts Institute of Technology. Department of Physics Electron-electron (e-e) collisions can impact transport in a variety of surprising and sometimes counterintuitive ways. Despite strong interest, experiments on the subject proved challenging because of the simultaneous presence of different scattering mechanisms that suppress or obscure consequences of e-e scattering. Only recently, sufficiently clean electron systems with transport dominated by e-e collisions have become available, showing behaviour characteristic of highly viscous fluids. Here we study electron transport through graphene constrictions and show that their conductance below 150 K increases with increasing temperature, in stark contrast to the metallic character of doped graphene. Notably, the measured conductance exceeds the maximum conductance possible for free electrons. This anomalous behaviour is attributed to collective movement of interacting electrons, which € shields' individual carriers from momentum loss at sample boundaries. The measurements allow us to identify the conductance contribution arising due to electron viscosity and determine its temperature dependence. Besides fundamental interest, our work shows that viscous effects can facilitate high-mobility transport at elevated temperatures, a potentially useful behaviour for designing graphene-based devices. 2019-06-17T18:50:26Z 2019-06-17T18:50:26Z 2017-08 2017-03 2019-03-29T15:55:24Z Article http://purl.org/eprint/type/JournalArticle 1745-2473 1745-2481 https://hdl.handle.net/1721.1/121330 Krishna Kumar, R. et al. “Superballistic Flow of Viscous Electron Fluid through Graphene Constrictions.” Nature Physics 13, 12 (August 2017): 1182–1185 http://dx.doi.org/10.1038/NPHYS4240 Nature Physics Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf Springer Nature arXiv |
| spellingShingle | Krishna Kumar, R. Bandurin, D. A. Pellegrino, F. M. D. Cao, Y. Principi, A. Guo, Haoyu Auton, G. H. Ben Shalom, M. Ponomarenko, L. A. Falkovich, G. Watanabe, K. Taniguchi, T. Grigorieva, I. V. Levitov, Leonid Polini, M. Geim, A. K. Superballistic flow of viscous electron fluid through graphene constrictions |
| title | Superballistic flow of viscous electron fluid through graphene constrictions |
| title_full | Superballistic flow of viscous electron fluid through graphene constrictions |
| title_fullStr | Superballistic flow of viscous electron fluid through graphene constrictions |
| title_full_unstemmed | Superballistic flow of viscous electron fluid through graphene constrictions |
| title_short | Superballistic flow of viscous electron fluid through graphene constrictions |
| title_sort | superballistic flow of viscous electron fluid through graphene constrictions |
| url | https://hdl.handle.net/1721.1/121330 |
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