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Conference Paper: Excitons as massless and massive Dirac particles in monolayer transition metal dichalcogenides
Title | Excitons as massless and massive Dirac particles in monolayer transition metal dichalcogenides |
---|---|
Authors | |
Issue Date | 2014 |
Publisher | American 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? |
Abstract | In 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. |
Description | Session B51 DMP: Focus Session: Beyond Graphene: Synthesis, Defects, Structure, and
Properties II |
Persistent Identifier | http://hdl.handle.net/10722/201410 |
ISSN |
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 | Xu, X | en_US |
dc.contributor.author | Yao, W | en_US |
dc.date.accessioned | 2014-08-21T07:26:39Z | - |
dc.date.available | 2014-08-21T07:26:39Z | - |
dc.date.issued | 2014 | en_US |
dc.identifier.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 | en_US |
dc.identifier.issn | 0003-0503 | - |
dc.identifier.uri | http://hdl.handle.net/10722/201410 | - |
dc.description | Session B51 DMP: Focus Session: Beyond Graphene: Synthesis, Defects, Structure, and Properties II | - |
dc.description.abstract | In 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.language | eng | en_US |
dc.publisher | American Physical Society. The Journal's web site is located at http://www.aps.org/memb/guide/prbook-baps.cfm | - |
dc.relation.ispartof | American Physical Society Bulletin | en_US |
dc.title | Excitons as massless and massive Dirac particles in monolayer transition metal dichalcogenides | en_US |
dc.type | Conference_Paper | 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.identifier.hkuros | 234275 | en_US |
dc.identifier.volume | 59 | - |
dc.identifier.issue | 1 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 0003-0503 | - |