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Article: Probing the exciton k-space dynamics in monolayer tungsten diselenides

TitleProbing the exciton k-space dynamics in monolayer tungsten diselenides
Authors
KeywordsDegrees of freedom (mechanics)
Dynamics
Excited states
Ground state
Magnetic moments
Issue Date2019
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2053-1583/
Citation
2D Materials, 2019, v. 6 n. 2, p. 025035:1-5 How to Cite?
AbstractMonolayer transition metal dichalcogenides (TMDs) provide 2D semiconductors with a rich interplay of electron spin and valley degrees of freedom. Along with strong optical coupling strength, it provides an ideal platform to study exciton-related physics in the 2D limit. Intensive experimental approaches on exciton dynamics in monolayer TMDs have been focusing on the lifetime of the exciton, exciton valley/spin polarization, and coherence, whereas the 'hot' exciton relaxation is rarely addressed. Here we probe the dynamics of bright excitons in monolayer tungsten diselenides, by pumping at exciton ground state and probing at higher energy, where excitonic excited states can be identified from the pump-probe spectroscopy. Remarkably, the rise time of the differential reflection signal increases significantly with the index of the excited states, which we attribute to the phase-space filling effect that probes the momentum distribution of ground state exciton. Our results reveal fast exciton momentum relaxation as a signature of the strong Coulomb interaction in 2D TMDs.
Persistent Identifierhttp://hdl.handle.net/10722/272947
ISSN
2017 Impact Factor: 7.042
2015 SCImago Journal Rankings: 4.344

 

DC FieldValueLanguage
dc.contributor.authorYan, T-
dc.contributor.authorYu, H-
dc.contributor.authorXIAO, K-
dc.contributor.authorYao, W-
dc.contributor.authorCui, X-
dc.date.accessioned2019-08-06T09:19:37Z-
dc.date.available2019-08-06T09:19:37Z-
dc.date.issued2019-
dc.identifier.citation2D Materials, 2019, v. 6 n. 2, p. 025035:1-5-
dc.identifier.issn2053-1583-
dc.identifier.urihttp://hdl.handle.net/10722/272947-
dc.description.abstractMonolayer transition metal dichalcogenides (TMDs) provide 2D semiconductors with a rich interplay of electron spin and valley degrees of freedom. Along with strong optical coupling strength, it provides an ideal platform to study exciton-related physics in the 2D limit. Intensive experimental approaches on exciton dynamics in monolayer TMDs have been focusing on the lifetime of the exciton, exciton valley/spin polarization, and coherence, whereas the 'hot' exciton relaxation is rarely addressed. Here we probe the dynamics of bright excitons in monolayer tungsten diselenides, by pumping at exciton ground state and probing at higher energy, where excitonic excited states can be identified from the pump-probe spectroscopy. Remarkably, the rise time of the differential reflection signal increases significantly with the index of the excited states, which we attribute to the phase-space filling effect that probes the momentum distribution of ground state exciton. Our results reveal fast exciton momentum relaxation as a signature of the strong Coulomb interaction in 2D TMDs.-
dc.languageeng-
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2053-1583/-
dc.relation.ispartof2D Materials-
dc.rights2D Materials. Copyright © Institute of Physics Publishing Ltd.-
dc.rightsThis is an author-created, un-copyedited version of an article published in [insert name of journal]. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/[insert DOI].-
dc.subjectDegrees of freedom (mechanics)-
dc.subjectDynamics-
dc.subjectExcited states-
dc.subjectGround state-
dc.subjectMagnetic moments-
dc.titleProbing the exciton k-space dynamics in monolayer tungsten diselenides-
dc.typeArticle-
dc.identifier.emailYan, T: yantf@hku.hk-
dc.identifier.emailYu, H: yuhongyi@hku.hk-
dc.identifier.emailYao, W: wangyao@hku.hk-
dc.identifier.emailCui, X: xdcui@hku.hk-
dc.identifier.authorityYu, H=rp02112-
dc.identifier.authorityYao, W=rp00827-
dc.identifier.authorityCui, X=rp00689-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1088/2053-1583/ab0a4e-
dc.identifier.scopuseid_2-s2.0-85065302789-
dc.identifier.hkuros300871-
dc.identifier.volume6-
dc.identifier.issue2-
dc.identifier.spage025035:1-
dc.identifier.epage5-
dc.publisher.placeUnited Kingdom-

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