Topological Valley Currents in Gapped Dirac Materials
Gapped 2D Dirac materials, in which inversion symmetry is broken by a gap-opening perturbation, feature a unique valley transport regime. Topological valley currents in such materials are dominated by bulk currents produced by electronic states just beneath the gap rather than by edge modes. The sys...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
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American Physical Society
2015
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| Online Access: | http://hdl.handle.net/1721.1/97542 https://orcid.org/0000-0002-4268-731X |
| _version_ | 1826203712064847872 |
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| author | Lensky, Yuri D. Song, Justin C. W. Samutpraphoot, Polnop Levitov, Leonid |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Lensky, Yuri D. Song, Justin C. W. Samutpraphoot, Polnop Levitov, Leonid |
| author_sort | Lensky, Yuri D. |
| collection | MIT |
| description | Gapped 2D Dirac materials, in which inversion symmetry is broken by a gap-opening perturbation, feature a unique valley transport regime. Topological valley currents in such materials are dominated by bulk currents produced by electronic states just beneath the gap rather than by edge modes. The system ground state hosts dissipationless persistent valley currents existing even when topologically protected edge modes are absent. Valley currents induced by an external bias are characterized by a quantized half-integer valley Hall conductivity. The undergap currents dominate magnetization and the charge Hall effect in a light-induced valley-polarized state. |
| first_indexed | 2024-09-23T12:41:51Z |
| format | Article |
| id | mit-1721.1/97542 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T12:41:51Z |
| publishDate | 2015 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/975422022-10-01T10:32:08Z Topological Valley Currents in Gapped Dirac Materials Lensky, Yuri D. Song, Justin C. W. Samutpraphoot, Polnop Levitov, Leonid Massachusetts Institute of Technology. Department of Physics Lensky, Yuri D. Samutpraphoot, Polnop Levitov, Leonid Gapped 2D Dirac materials, in which inversion symmetry is broken by a gap-opening perturbation, feature a unique valley transport regime. Topological valley currents in such materials are dominated by bulk currents produced by electronic states just beneath the gap rather than by edge modes. The system ground state hosts dissipationless persistent valley currents existing even when topologically protected edge modes are absent. Valley currents induced by an external bias are characterized by a quantized half-integer valley Hall conductivity. The undergap currents dominate magnetization and the charge Hall effect in a light-induced valley-polarized state. National Science Foundation (U.S.). Center for Integrated Quantum Materials (Grant DMR-1231319) Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies (Contract W911NF-13-D-0001) 2015-06-29T14:24:29Z 2015-06-29T14:24:29Z 2015-06 2014-12 2015-06-24T22:00:03Z Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/97542 Lensky, Yuri D., Justin C. W. Song, Polnop Samutprahoot, and Leonid S. Levitov. "Topological Valley Currents in Gapped Dirac Materials." Phys. Rev. Lett. 114, 256601 (June 2015). © 2015 American Physical Society https://orcid.org/0000-0002-4268-731X en http://dx.doi.org/10.1103/PhysRevLett.114.256601 Physical Review Letters 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. American Physical Society application/pdf American Physical Society American Physical Society |
| spellingShingle | Lensky, Yuri D. Song, Justin C. W. Samutpraphoot, Polnop Levitov, Leonid Topological Valley Currents in Gapped Dirac Materials |
| title | Topological Valley Currents in Gapped Dirac Materials |
| title_full | Topological Valley Currents in Gapped Dirac Materials |
| title_fullStr | Topological Valley Currents in Gapped Dirac Materials |
| title_full_unstemmed | Topological Valley Currents in Gapped Dirac Materials |
| title_short | Topological Valley Currents in Gapped Dirac Materials |
| title_sort | topological valley currents in gapped dirac materials |
| url | http://hdl.handle.net/1721.1/97542 https://orcid.org/0000-0002-4268-731X |
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