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Article: Dirac cones and Dirac saddle points of bright excitons in monolayer transition metal dichalcogenides

TitleDirac cones and Dirac saddle points of bright excitons in monolayer transition metal dichalcogenides
Authors
Issue Date2014
PublisherMacmillan Publishers Limited. The Journal's web site is located at http://www.nature.com/ncomms/index.html
Citation
Nature Communications, 2014, v. 5, p. 3876:1-7 How to Cite?
AbstractIn monolayer transition metal dichalcogenides, tightly bound excitons have been discovered with a valley pseudospin optically addressable through polarization selection rules. Here, we show that this valley pseudospin is strongly coupled to the exciton centre-of-mass motion through electron-hole exchange. This coupling realizes a massless Dirac cone with chirality index I=2 for excitons inside the light cone, that is, bright excitons. Under moderate strain, the I=2 Dirac cone splits into two degenerate I=1 Dirac cones, and saddle points with a linear Dirac spectrum emerge. After binding an extra electron, the charged exciton becomes a massive Dirac particle associated with a large valley Hall effect protected from intervalley scattering. Our results point to unique opportunities to study Dirac physics, with exciton's optical addressability at specifiable momentum, energy and pseudospin. The strain-tunable valley-orbit coupling also implies new structures of exciton condensates, new functionalities of excitonic circuits and mechanical control of valley pseudospin. © 2014 Macmillan Publishers Limited.
Persistent Identifierhttp://hdl.handle.net/10722/198070
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorYu, Hen_US
dc.contributor.authorLiu, Gen_US
dc.contributor.authorGONG, Pen_US
dc.contributor.authorXu, XDen_US
dc.contributor.authorYao, Wen_US
dc.date.accessioned2014-06-25T02:44:09Z-
dc.date.available2014-06-25T02:44:09Z-
dc.date.issued2014en_US
dc.identifier.citationNature Communications, 2014, v. 5, p. 3876:1-7en_US
dc.identifier.urihttp://hdl.handle.net/10722/198070-
dc.description.abstractIn monolayer transition metal dichalcogenides, tightly bound excitons have been discovered with a valley pseudospin optically addressable through polarization selection rules. Here, we show that this valley pseudospin is strongly coupled to the exciton centre-of-mass motion through electron-hole exchange. This coupling realizes a massless Dirac cone with chirality index I=2 for excitons inside the light cone, that is, bright excitons. Under moderate strain, the I=2 Dirac cone splits into two degenerate I=1 Dirac cones, and saddle points with a linear Dirac spectrum emerge. After binding an extra electron, the charged exciton becomes a massive Dirac particle associated with a large valley Hall effect protected from intervalley scattering. Our results point to unique opportunities to study Dirac physics, with exciton's optical addressability at specifiable momentum, energy and pseudospin. The strain-tunable valley-orbit coupling also implies new structures of exciton condensates, new functionalities of excitonic circuits and mechanical control of valley pseudospin. © 2014 Macmillan Publishers Limited.-
dc.languageengen_US
dc.publisherMacmillan Publishers Limited. The Journal's web site is located at http://www.nature.com/ncomms/index.htmlen_US
dc.relation.ispartofNature Communicationsen_US
dc.titleDirac cones and Dirac saddle points of bright excitons in monolayer transition metal dichalcogenidesen_US
dc.typeArticleen_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.doi10.1038/ncomms4876en_US
dc.identifier.pmid24821438-
dc.identifier.scopuseid_2-s2.0-84900464888-
dc.identifier.hkuros229540en_US
dc.identifier.volume5en_US
dc.identifier.spage3876:1en_US
dc.identifier.epage7en_US
dc.identifier.isiWOS:000337503800020-

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