Detecting topological currents in graphene superlattices
Topological materials may exhibit Hall-like currents flowing transversely to the applied electric field even in the absence of a magnetic field. In graphene superlattices, which have broken inversion symmetry, topological currents originating from graphene's two valleys are predicted to flow in...
| Main Authors: | , , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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American Association for the Advancement of Science (AAAS)
2014
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| Online Access: | http://hdl.handle.net/1721.1/89816 https://orcid.org/0000-0002-4268-731X |
| _version_ | 1826202548183236608 |
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| author | Gorbachev, R. V. Yu, G. L. Kretinin, A. V. Withers, F. Cao, Y. Mishchenko, A. Grigorieva, I. V. Novoselov, Kostya S. Geim, A. K. Song, Justin Chien Wen Levitov, Leonid |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Gorbachev, R. V. Yu, G. L. Kretinin, A. V. Withers, F. Cao, Y. Mishchenko, A. Grigorieva, I. V. Novoselov, Kostya S. Geim, A. K. Song, Justin Chien Wen Levitov, Leonid |
| author_sort | Gorbachev, R. V. |
| collection | MIT |
| description | Topological materials may exhibit Hall-like currents flowing transversely to the applied electric field even in the absence of a magnetic field. In graphene superlattices, which have broken inversion symmetry, topological currents originating from graphene's two valleys are predicted to flow in opposite directions and combine to produce long-range charge neutral flow. We observe this effect as a nonlocal voltage at zero magnetic field in a narrow energy range near Dirac points at distances as large as several microns away from the nominal current path. Locally, topological currents are comparable in strength to the applied current, indicating large valley-Hall angles. The long-range character of topological currents and their transistor-like control by gate voltage can be exploited for information processing based on the valley degrees of freedom. |
| first_indexed | 2024-09-23T12:09:14Z |
| format | Article |
| id | mit-1721.1/89816 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:09:14Z |
| publishDate | 2014 |
| publisher | American Association for the Advancement of Science (AAAS) |
| record_format | dspace |
| spelling | mit-1721.1/898162022-10-01T08:30:17Z Detecting topological currents in graphene superlattices Gorbachev, R. V. Yu, G. L. Kretinin, A. V. Withers, F. Cao, Y. Mishchenko, A. Grigorieva, I. V. Novoselov, Kostya S. Geim, A. K. Song, Justin Chien Wen Levitov, Leonid Massachusetts Institute of Technology. Department of Physics Song, Justin Chien Wen Levitov, Leonid Topological materials may exhibit Hall-like currents flowing transversely to the applied electric field even in the absence of a magnetic field. In graphene superlattices, which have broken inversion symmetry, topological currents originating from graphene's two valleys are predicted to flow in opposite directions and combine to produce long-range charge neutral flow. We observe this effect as a nonlocal voltage at zero magnetic field in a narrow energy range near Dirac points at distances as large as several microns away from the nominal current path. Locally, topological currents are comparable in strength to the applied current, indicating large valley-Hall angles. The long-range character of topological currents and their transistor-like control by gate voltage can be exploited for information processing based on the valley degrees of freedom. 2014-09-18T18:02:13Z 2014-09-18T18:02:13Z 2014-09 2014-04 Article http://purl.org/eprint/type/JournalArticle 0036-8075 1095-9203 http://hdl.handle.net/1721.1/89816 Gorbachev, R. V., J. C. W. Song, G. L. Yu, A. V. Kretinin, F. Withers, Y. Cao, A. Mishchenko, et al. “Detecting Topological Currents in Graphene Superlattices.” Science (September 11, 2014). https://orcid.org/0000-0002-4268-731X en_US http://dx.doi.org/10.1126/science.1254966 Science Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf American Association for the Advancement of Science (AAAS) arXiv |
| spellingShingle | Gorbachev, R. V. Yu, G. L. Kretinin, A. V. Withers, F. Cao, Y. Mishchenko, A. Grigorieva, I. V. Novoselov, Kostya S. Geim, A. K. Song, Justin Chien Wen Levitov, Leonid Detecting topological currents in graphene superlattices |
| title | Detecting topological currents in graphene superlattices |
| title_full | Detecting topological currents in graphene superlattices |
| title_fullStr | Detecting topological currents in graphene superlattices |
| title_full_unstemmed | Detecting topological currents in graphene superlattices |
| title_short | Detecting topological currents in graphene superlattices |
| title_sort | detecting topological currents in graphene superlattices |
| url | http://hdl.handle.net/1721.1/89816 https://orcid.org/0000-0002-4268-731X |
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