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Topological Valley Currents in Gapped Dirac Materials

Lensky, Yuri D. and Song, Justin C. W. and Samutpraphoot, Polnop and Levitov, Leonid S. (2015) Topological Valley Currents in Gapped Dirac Materials. Physical Review Letters, 114 (25). Art. No. 256601. ISSN 0031-9007. doi:10.1103/PhysRevLett.114.256601.

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Gapped 2D Dirac materials, in which inversion symmetry is broken by a gap-opening perturbation, feature a unique valley transport regime. The system ground state hosts dissipationless persistent valley currents existing even when topologically protected edge modes are absent or when they are localized due to edge roughness. Topological valley currents in such materials are dominated by bulk currents produced by electronic states just beneath the gap rather than by edge modes. Dissipationless currents induced by an external bias are characterized by a quantized half-integer valley Hall conductivity. The under-gap currents dominate magnetization and the charge Hall effect in a light-induced valley-polarized state.

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Song, Justin C. W.0000-0002-5175-6970
Additional Information:© 2015 American Physical Society. Received 6 December 2014. Published 24 June 2015. We thank R. C. Ashoori, A. K. Geim, and P. L. McEuen for useful discussions. This work was supported by STC Center for Integrated Quantum Materials, NSF Grant No. DMR-1231319 and in part by the U. S. Army Research Laboratory and the U. S. Army Research Office through the Institute for Soldier Nanotechnologies, under contract No. W911NF-13-D-0001. J. C. W. S. was supported by a Burke Fellowship at Caltech.
Group:Institute for Quantum Information and Matter, Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Army Research LaboratoryW911NF-13-D-0001
Walter Burke Institute for Theoretical Physics, CaltechUNSPECIFIED
Issue or Number:25
Classification Code:PACS numbers: 72.80.Vp
Record Number:CaltechAUTHORS:20150702-114252795
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58753
Deposited By: Joy Painter
Deposited On:02 Jul 2015 19:29
Last Modified:10 Nov 2021 22:10

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