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Article: Anomalous Light Cones and Valley Optical Selection Rules of Interlayer Excitons in Twisted Heterobilayers

TitleAnomalous Light Cones and Valley Optical Selection Rules of Interlayer Excitons in Twisted Heterobilayers
Authors
Issue Date2015
PublisherAmerican Physical Society. The Journal's web site is located at http://prl.aps.org
Citation
Physical Review Letters, 2015, v. 115, n. 18 How to Cite?
Abstract© 2015 American Physical Society. © 2015 American Physical Society. We show that, because of the inevitable twist and lattice mismatch in heterobilayers of transition metal dichalcogenides, interlayer excitons have sixfold degenerate light cones anomalously located at finite velocities on the parabolic energy dispersion. The photon emissions at each light cone are elliptically polarized, with the major axis locked to the direction of exciton velocity, and helicity specified by the valley indices of the electron and the hole. These finite-velocity light cones allow unprecedented possibilities for optically injecting valley polarization and valley current, and the observation of both direct and inverse valley Hall effects, by exciting interlayer excitons. Our findings suggest potential excitonic circuits with valley functionalities, and unique opportunities to study exciton dynamics and condensation phenomena in semiconducting 2D heterostructures.
Persistent Identifierhttp://hdl.handle.net/10722/222184
ISSN
2015 Impact Factor: 7.645
2015 SCImago Journal Rankings: 3.731

 

DC FieldValueLanguage
dc.contributor.authorYu, Hongyi-
dc.contributor.authorWang, Yong-
dc.contributor.authorTong, Qingjun-
dc.contributor.authorXu, Xiaodong-
dc.contributor.authorYao, Wang-
dc.date.accessioned2015-12-21T06:49:13Z-
dc.date.available2015-12-21T06:49:13Z-
dc.date.issued2015-
dc.identifier.citationPhysical Review Letters, 2015, v. 115, n. 18-
dc.identifier.issn0031-9007-
dc.identifier.urihttp://hdl.handle.net/10722/222184-
dc.description.abstract© 2015 American Physical Society. © 2015 American Physical Society. We show that, because of the inevitable twist and lattice mismatch in heterobilayers of transition metal dichalcogenides, interlayer excitons have sixfold degenerate light cones anomalously located at finite velocities on the parabolic energy dispersion. The photon emissions at each light cone are elliptically polarized, with the major axis locked to the direction of exciton velocity, and helicity specified by the valley indices of the electron and the hole. These finite-velocity light cones allow unprecedented possibilities for optically injecting valley polarization and valley current, and the observation of both direct and inverse valley Hall effects, by exciting interlayer excitons. Our findings suggest potential excitonic circuits with valley functionalities, and unique opportunities to study exciton dynamics and condensation phenomena in semiconducting 2D heterostructures.-
dc.languageeng-
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prl.aps.org-
dc.relation.ispartofPhysical Review Letters-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleAnomalous Light Cones and Valley Optical Selection Rules of Interlayer Excitons in Twisted Heterobilayers-
dc.typeArticle-
dc.description.naturepostprint-
dc.identifier.doi10.1103/PhysRevLett.115.187002-
dc.identifier.scopuseid_2-s2.0-84946606842-
dc.identifier.hkuros256431-
dc.identifier.volume115-
dc.identifier.issue18-
dc.identifier.eissn1079-7114-

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