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Article: Direct measurement of exciton valley coherence in monolayer WSe 2

TitleDirect measurement of exciton valley coherence in monolayer WSe <inf>2</inf>
Authors
Issue Date2016
Citation
Nature Physics, 2016, v. 12, n. 7, p. 677-682 How to Cite?
AbstractIn crystals, energy band extrema in momentum space can be identified by a valley index. The internal quantum degree of freedom associated with valley pseudospin indices can act as a useful information carrier, analogous to electronic charge or spin. Interest in valleytronics has been revived in recent years following the discovery of atomically thin materials such as graphene and transition metal dichalcogenides. However, the valley coherence time - a crucial quantity for valley pseudospin manipulation - is difficult to directly probe. In this work, we use two-dimensional coherent spectroscopy to resonantly generate and detect valley coherence of excitons (Coulomb-bound electron-hole pairs) in monolayer WSe (refs,). The imposed valley coherence persists for approximately one hundred femtoseconds. We propose that the electron-hole exchange interaction provides an important decoherence mechanism in addition to exciton population recombination. This work provides critical insight into the requirements and strategies for optical manipulation of the valley pseudospin for future valleytronics applications. 2
Persistent Identifierhttp://hdl.handle.net/10722/298143
ISSN
2020 Impact Factor: 20.034
2020 SCImago Journal Rankings: 9.157
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorHao, Kai-
dc.contributor.authorMoody, Galan-
dc.contributor.authorWu, Fengcheng-
dc.contributor.authorDass, Chandriker Kavir-
dc.contributor.authorXu, Lixiang-
dc.contributor.authorChen, Chang Hsiao-
dc.contributor.authorSun, Liuyang-
dc.contributor.authorLi, Ming Yang-
dc.contributor.authorLi, Lain Jong-
dc.contributor.authorMacDonald, Allan H.-
dc.contributor.authorLi, Xiaoqin-
dc.date.accessioned2021-04-08T03:07:46Z-
dc.date.available2021-04-08T03:07:46Z-
dc.date.issued2016-
dc.identifier.citationNature Physics, 2016, v. 12, n. 7, p. 677-682-
dc.identifier.issn1745-2473-
dc.identifier.urihttp://hdl.handle.net/10722/298143-
dc.description.abstractIn crystals, energy band extrema in momentum space can be identified by a valley index. The internal quantum degree of freedom associated with valley pseudospin indices can act as a useful information carrier, analogous to electronic charge or spin. Interest in valleytronics has been revived in recent years following the discovery of atomically thin materials such as graphene and transition metal dichalcogenides. However, the valley coherence time - a crucial quantity for valley pseudospin manipulation - is difficult to directly probe. In this work, we use two-dimensional coherent spectroscopy to resonantly generate and detect valley coherence of excitons (Coulomb-bound electron-hole pairs) in monolayer WSe (refs,). The imposed valley coherence persists for approximately one hundred femtoseconds. We propose that the electron-hole exchange interaction provides an important decoherence mechanism in addition to exciton population recombination. This work provides critical insight into the requirements and strategies for optical manipulation of the valley pseudospin for future valleytronics applications. 2-
dc.languageeng-
dc.relation.ispartofNature Physics-
dc.titleDirect measurement of exciton valley coherence in monolayer WSe <inf>2</inf>-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1038/nphys3674-
dc.identifier.scopuseid_2-s2.0-84959252383-
dc.identifier.volume12-
dc.identifier.issue7-
dc.identifier.spage677-
dc.identifier.epage682-
dc.identifier.eissn1745-2481-
dc.identifier.isiWOS:000379269900025-
dc.identifier.issnl1745-2473-

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