Measuring Hall viscosity of graphene's electron fluid
An electrical conductor subjected to a magnetic field exhibits the Hall effect in the presence of current flow. Here we report a qualitative deviation from the standard behavior in electron systems with high viscosity. We find that the viscous electron fluid in graphene responds to non-quantizing ma...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) Jg. 364; H. 6436; S. 162 |
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12.04.2019
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| Abstract | An electrical conductor subjected to a magnetic field exhibits the Hall effect in the presence of current flow. Here we report a qualitative deviation from the standard behavior in electron systems with high viscosity. We find that the viscous electron fluid in graphene responds to non-quantizing magnetic fields by producing an electric field opposite to that generated by the ordinary Hall effect. The viscous contribution is substantial and identified by studying local voltages that arise in the vicinity of current-injecting contacts. We analyze the anomaly over a wide range of temperatures and carrier densities and extract the Hall viscosity, a dissipationless transport coefficient that was long identified theoretically but remained elusive in experiments. |
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| AbstractList | An electrical conductor subjected to a magnetic field exhibits the Hall effect in the presence of current flow. Here, we report a qualitative deviation from the standard behavior in electron systems with high viscosity. We found that the viscous electron fluid in graphene responds to nonquantizing magnetic fields by producing an electric field opposite to that generated by the ordinary Hall effect. The viscous contribution is substantial and identified by studying local voltages that arise in the vicinity of current-injecting contacts. We analyzed the anomaly over a wide range of temperatures and carrier densities and extracted the Hall viscosity, a dissipationless transport coefficient that was long identified theoretically but remained elusive in experiments.An electrical conductor subjected to a magnetic field exhibits the Hall effect in the presence of current flow. Here, we report a qualitative deviation from the standard behavior in electron systems with high viscosity. We found that the viscous electron fluid in graphene responds to nonquantizing magnetic fields by producing an electric field opposite to that generated by the ordinary Hall effect. The viscous contribution is substantial and identified by studying local voltages that arise in the vicinity of current-injecting contacts. We analyzed the anomaly over a wide range of temperatures and carrier densities and extracted the Hall viscosity, a dissipationless transport coefficient that was long identified theoretically but remained elusive in experiments. An electrical conductor subjected to a magnetic field exhibits the Hall effect in the presence of current flow. Here we report a qualitative deviation from the standard behavior in electron systems with high viscosity. We find that the viscous electron fluid in graphene responds to non-quantizing magnetic fields by producing an electric field opposite to that generated by the ordinary Hall effect. The viscous contribution is substantial and identified by studying local voltages that arise in the vicinity of current-injecting contacts. We analyze the anomaly over a wide range of temperatures and carrier densities and extract the Hall viscosity, a dissipationless transport coefficient that was long identified theoretically but remained elusive in experiments. |
| Author | Watanabe, K Bandurin, D A Grigorieva, I V Principi, A Geim, A K Xu, S G Taniguchi, T Pellegrino, F M D Krishna Kumar, R Polini, M Ben Shalom, M Torre, I Berdyugin, A I |
| Author_xml | – sequence: 1 givenname: A I orcidid: 0000-0002-7537-6227 surname: Berdyugin fullname: Berdyugin, A I organization: School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK – sequence: 2 givenname: S G orcidid: 0000-0002-0589-5291 surname: Xu fullname: Xu, S G organization: National Graphene Institute, University of Manchester, Manchester M13 9PL, UK – sequence: 3 givenname: F M D orcidid: 0000-0001-5425-1292 surname: Pellegrino fullname: Pellegrino, F M D organization: INFN, Sez. Catania, I-95123 Catania, Italy – sequence: 4 givenname: R orcidid: 0000-0003-0857-4466 surname: Krishna Kumar fullname: Krishna Kumar, R organization: National Graphene Institute, University of Manchester, Manchester M13 9PL, UK – sequence: 5 givenname: A surname: Principi fullname: Principi, A organization: School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK – sequence: 6 givenname: I orcidid: 0000-0001-6515-181X surname: Torre fullname: Torre, I organization: ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain – sequence: 7 givenname: M orcidid: 0000-0001-5781-0037 surname: Ben Shalom fullname: Ben Shalom, M organization: National Graphene Institute, University of Manchester, Manchester M13 9PL, UK – sequence: 8 givenname: T surname: Taniguchi fullname: Taniguchi, T organization: National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044 Japan – sequence: 9 givenname: K orcidid: 0000-0003-3701-8119 surname: Watanabe fullname: Watanabe, K organization: National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044 Japan – sequence: 10 givenname: I V orcidid: 0000-0001-5991-7778 surname: Grigorieva fullname: Grigorieva, I V organization: School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK – sequence: 11 givenname: M surname: Polini fullname: Polini, M organization: Istituto Italiano di Tecnologia, Graphene Labs, Via Morego 30, 16163 Genova, Italy – sequence: 12 givenname: A K orcidid: 0000-0003-2861-8331 surname: Geim fullname: Geim, A K email: geim@manchester.ac.uk, bandurin.d@gmail.com organization: National Graphene Institute, University of Manchester, Manchester M13 9PL, UK – sequence: 13 givenname: D A orcidid: 0000-0001-9257-4105 surname: Bandurin fullname: Bandurin, D A email: geim@manchester.ac.uk, bandurin.d@gmail.com organization: School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK. geim@manchester.ac.uk bandurin.d@gmail.com |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/30819929$$D View this record in MEDLINE/PubMed |
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| Snippet | An electrical conductor subjected to a magnetic field exhibits the Hall effect in the presence of current flow. Here we report a qualitative deviation from the... An electrical conductor subjected to a magnetic field exhibits the Hall effect in the presence of current flow. Here, we report a qualitative deviation from... |
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