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Article: Moiré Valleytronics: Realizing Dense Arrays of Topological Helical Channels

TitleMoiré Valleytronics: Realizing Dense Arrays of Topological Helical Channels
Authors
Issue Date2018
PublisherAmerican Physical Society. The Journal's web site is located at http://prl.aps.org
Citation
Physical Review Letters, 2018, v. 121 n. 18, article no. 186403 , p. 1-6 How to Cite?
AbstractWe propose a general and robust platform, the moiré valleytronics, to realize high-density arrays of 1D topological helical channels in real materials at room temperature. We demonstrate the idea using a long-period 1D moiré pattern of graphene on hBN by first-principles calculation. Through calculating the Berry curvature and topological charge of the electronic structure associated with various local graphene/hBN stackings in the moiré pattern, it is revealed that the helical channel arrays originate intrinsically from the periodic modulation of the local topological orders by the moiré pattern. For a freestanding wavelike moiré pattern, two groups of helical channel arrays are spatially separated out of plane, validating the structural robustness of the moiré topology. The generality and experimental feasibility of moiré valleytronics are demonstrated by investigating a broad range of moiré systems.
Persistent Identifierhttp://hdl.handle.net/10722/266029
ISSN
2019 Impact Factor: 8.385
2015 SCImago Journal Rankings: 3.731
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorHu, C-
dc.contributor.authorMichaud-Rioux, V-
dc.contributor.authorYao, W-
dc.contributor.authorGuo, H-
dc.date.accessioned2018-12-17T02:16:35Z-
dc.date.available2018-12-17T02:16:35Z-
dc.date.issued2018-
dc.identifier.citationPhysical Review Letters, 2018, v. 121 n. 18, article no. 186403 , p. 1-6-
dc.identifier.issn0031-9007-
dc.identifier.urihttp://hdl.handle.net/10722/266029-
dc.description.abstractWe propose a general and robust platform, the moiré valleytronics, to realize high-density arrays of 1D topological helical channels in real materials at room temperature. We demonstrate the idea using a long-period 1D moiré pattern of graphene on hBN by first-principles calculation. Through calculating the Berry curvature and topological charge of the electronic structure associated with various local graphene/hBN stackings in the moiré pattern, it is revealed that the helical channel arrays originate intrinsically from the periodic modulation of the local topological orders by the moiré pattern. For a freestanding wavelike moiré pattern, two groups of helical channel arrays are spatially separated out of plane, validating the structural robustness of the moiré topology. The generality and experimental feasibility of moiré valleytronics are demonstrated by investigating a broad range of moiré systems.-
dc.languageeng-
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prl.aps.org-
dc.relation.ispartofPhysical Review Letters-
dc.rightsCopyright 2018 by The American Physical Society. This article is available online at https://doi.org/10.1103/PhysRevLett.121.186403-
dc.titleMoiré Valleytronics: Realizing Dense Arrays of Topological Helical Channels-
dc.typeArticle-
dc.identifier.emailYao, W: wangyao@hku.hk-
dc.identifier.authorityYao, W=rp00827-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevLett.121.186403-
dc.identifier.scopuseid_2-s2.0-85056077144-
dc.identifier.hkuros296246-
dc.identifier.volume121-
dc.identifier.issue18-
dc.identifier.spagearticle no. 186403, p. 1-
dc.identifier.epagearticle no. 186403, p. 6-
dc.identifier.isiWOS:000449296500013-
dc.publisher.placeUnited States-

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