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Conference Paper: Excitons as massless and massive Dirac particles in monolayer transition metal dichalcogenides

TitleExcitons as massless and massive Dirac particles in monolayer transition metal dichalcogenides
Authors
Issue Date2014
PublisherAmerican Physical Society. The Journal's web site is located at http://www.aps.org/memb/guide/prbook-baps.cfm
Citation
American Physical Society (APS) March Meeting, Denver, Colorado, USA, 3-7 March 2014. In American Physical Society Bulletin, 2014, v. 59 n. 1, p. abstract no. B51.00003 How to Cite?
AbstractIn monolayer transition metal dichalcogenides, tightly bound excitons can form at +-K valleys, where optical generation of excitonic valley polarization and coherence can be realized through a polarization selection rule. Here, we show that the the electron-hole Coulomb exchange leads to the strong coupling between the valley pseudospin of bright exciton and its motion. In the light cone, the exciton dispersion exhibits a massless Dirac cone with chirality index I=2. Moderate tensile strain provides a powerful approach to tune the exciton dispersion. When the exciton binds an electron to form a negatively charged trion, the exchange interaction with the excess electron opens up a gap and the trion behaves as a massive Dirac particle. With the optical addressability at specifiable momentum and energy, excitons in monolayer transition metal dichalcogenides may provide unique opportunities to study Dirac particles.
DescriptionSession B51 DMP: Focus Session: Beyond Graphene: Synthesis, Defects, Structure, and Properties II
Persistent Identifierhttp://hdl.handle.net/10722/201410
ISSN

 

DC FieldValueLanguage
dc.contributor.authorYu, Hen_US
dc.contributor.authorLiu, Gen_US
dc.contributor.authorXu, Xen_US
dc.contributor.authorYao, Wen_US
dc.date.accessioned2014-08-21T07:26:39Z-
dc.date.available2014-08-21T07:26:39Z-
dc.date.issued2014en_US
dc.identifier.citationAmerican Physical Society (APS) March Meeting, Denver, Colorado, USA, 3-7 March 2014. In American Physical Society Bulletin, 2014, v. 59 n. 1, p. abstract no. B51.00003en_US
dc.identifier.issn0003-0503-
dc.identifier.urihttp://hdl.handle.net/10722/201410-
dc.descriptionSession B51 DMP: Focus Session: Beyond Graphene: Synthesis, Defects, Structure, and Properties II-
dc.description.abstractIn monolayer transition metal dichalcogenides, tightly bound excitons can form at +-K valleys, where optical generation of excitonic valley polarization and coherence can be realized through a polarization selection rule. Here, we show that the the electron-hole Coulomb exchange leads to the strong coupling between the valley pseudospin of bright exciton and its motion. In the light cone, the exciton dispersion exhibits a massless Dirac cone with chirality index I=2. Moderate tensile strain provides a powerful approach to tune the exciton dispersion. When the exciton binds an electron to form a negatively charged trion, the exchange interaction with the excess electron opens up a gap and the trion behaves as a massive Dirac particle. With the optical addressability at specifiable momentum and energy, excitons in monolayer transition metal dichalcogenides may provide unique opportunities to study Dirac particles.-
dc.languageengen_US
dc.publisherAmerican Physical Society. The Journal's web site is located at http://www.aps.org/memb/guide/prbook-baps.cfm-
dc.relation.ispartofAmerican Physical Society Bulletinen_US
dc.rightsAmerican Physical Society Bulletin. Copyright © American Physical Society.-
dc.titleExcitons as massless and massive Dirac particles in monolayer transition metal dichalcogenidesen_US
dc.typeConference_Paperen_US
dc.identifier.emailYu, H: yuhongyi@hku.hken_US
dc.identifier.emailLiu, G: gbliu@hku.hken_US
dc.identifier.emailYao, W: wangyao@hku.hken_US
dc.identifier.authorityYao, W=rp00827en_US
dc.identifier.hkuros234275en_US
dc.identifier.volume59-
dc.identifier.issue1-
dc.publisher.placeUnited States-

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