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- Publisher Website: 10.1038/ncomms4876
- Scopus: eid_2-s2.0-84900464888
- PMID: 24821438
- WOS: WOS:000337503800020
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Article: Dirac cones and Dirac saddle points of bright excitons in monolayer transition metal dichalcogenides
Title | Dirac cones and Dirac saddle points of bright excitons in monolayer transition metal dichalcogenides |
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Authors | |
Issue Date | 2014 |
Publisher | Macmillan 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? |
Abstract | In 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 Identifier | http://hdl.handle.net/10722/198070 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Yu, H | en_US |
dc.contributor.author | Liu, G | en_US |
dc.contributor.author | GONG, P | en_US |
dc.contributor.author | Xu, XD | en_US |
dc.contributor.author | Yao, W | en_US |
dc.date.accessioned | 2014-06-25T02:44:09Z | - |
dc.date.available | 2014-06-25T02:44:09Z | - |
dc.date.issued | 2014 | en_US |
dc.identifier.citation | Nature Communications, 2014, v. 5, p. 3876:1-7 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/198070 | - |
dc.description.abstract | In 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.language | eng | en_US |
dc.publisher | Macmillan Publishers Limited. The Journal's web site is located at http://www.nature.com/ncomms/index.html | en_US |
dc.relation.ispartof | Nature Communications | en_US |
dc.title | Dirac cones and Dirac saddle points of bright excitons in monolayer transition metal dichalcogenides | en_US |
dc.type | Article | en_US |
dc.identifier.email | Yu, H: yuhongyi@hku.hk | en_US |
dc.identifier.email | Liu, G: gbliu@hku.hk | en_US |
dc.identifier.email | Yao, W: wangyao@hku.hk | en_US |
dc.identifier.authority | Yao, W=rp00827 | en_US |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.doi | 10.1038/ncomms4876 | en_US |
dc.identifier.pmid | 24821438 | - |
dc.identifier.scopus | eid_2-s2.0-84900464888 | - |
dc.identifier.hkuros | 229540 | en_US |
dc.identifier.hkuros | 293934 | - |
dc.identifier.volume | 5 | en_US |
dc.identifier.spage | 3876:1 | en_US |
dc.identifier.epage | 7 | en_US |
dc.identifier.eissn | 2041-1723 | - |
dc.identifier.isi | WOS:000337503800020 | - |
dc.identifier.issnl | 2041-1723 | - |