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Article: Ultrafast generation of pseudo-magnetic field for valley excitons in WSe2 monolayers

TitleUltrafast generation of pseudo-magnetic field for valley excitons in WSe<inf>2</inf> monolayers
Authors
Issue Date2014
Citation
Science, 2014, v. 346, n. 6214, p. 1205-1208 How to Cite?
AbstractThe valley pseudospin is a degree of freedom that emerges in atomically thin two-dimensional transition metal dichalcogenides (MX ). The capability to manipulate it, in analogy to the control of spin in spintronics, can open up exciting opportunities. Here, we demonstrate that an ultrafast and ultrahigh valley pseudo-magnetic field can be generated by using circularly polarized femtosecond pulses to selectively control the valley degree of freedom in monolayer MX . Using ultrafast pump-probe spectroscopy, we observed a pure and valley-selective optical Stark effect in WSe monolayers from the nonresonant pump, resulting in an energy splitting of more than 10 milli-electron volts between the K and K′ valley exciton transitions. Our study opens up the possibility to coherently manipulate the valley polarization for quantum information applications. 2 2 2
Persistent Identifierhttp://hdl.handle.net/10722/298102
ISSN
2020 Impact Factor: 47.728
2020 SCImago Journal Rankings: 12.556

 

DC FieldValueLanguage
dc.contributor.authorKim, Jonghwan-
dc.contributor.authorHong, Xiaoping-
dc.contributor.authorJin, Chenhao-
dc.contributor.authorShi, Su Fei-
dc.contributor.authorChang, Chih Yuan S.-
dc.contributor.authorChiu, Ming Hui-
dc.contributor.authorLi, Lain Jong-
dc.contributor.authorWang, Feng-
dc.date.accessioned2021-04-08T03:07:40Z-
dc.date.available2021-04-08T03:07:40Z-
dc.date.issued2014-
dc.identifier.citationScience, 2014, v. 346, n. 6214, p. 1205-1208-
dc.identifier.issn0036-8075-
dc.identifier.urihttp://hdl.handle.net/10722/298102-
dc.description.abstractThe valley pseudospin is a degree of freedom that emerges in atomically thin two-dimensional transition metal dichalcogenides (MX ). The capability to manipulate it, in analogy to the control of spin in spintronics, can open up exciting opportunities. Here, we demonstrate that an ultrafast and ultrahigh valley pseudo-magnetic field can be generated by using circularly polarized femtosecond pulses to selectively control the valley degree of freedom in monolayer MX . Using ultrafast pump-probe spectroscopy, we observed a pure and valley-selective optical Stark effect in WSe monolayers from the nonresonant pump, resulting in an energy splitting of more than 10 milli-electron volts between the K and K′ valley exciton transitions. Our study opens up the possibility to coherently manipulate the valley polarization for quantum information applications. 2 2 2-
dc.languageeng-
dc.relation.ispartofScience-
dc.titleUltrafast generation of pseudo-magnetic field for valley excitons in WSe<inf>2</inf> monolayers-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1126/science.1258122-
dc.identifier.scopuseid_2-s2.0-84918539466-
dc.identifier.volume346-
dc.identifier.issue6214-
dc.identifier.spage1205-
dc.identifier.epage1208-
dc.identifier.eissn1095-9203-
dc.identifier.issnl0036-8075-

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