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

Handle URI:
http://hdl.handle.net/10754/338569
Title:
Ultrafast generation of pseudo-magnetic field for valley excitons in WSe2 monolayers
Authors:
Kim, J.; Hong, X.; Jin, C.; Shi, S.-F.; Chang, C.-Y. S.; Chiu, M.-H.; Li, Lain-Jong ( 0000-0002-4059-7783 ) ; Wang, F.
Abstract:
The valley pseudospin is a degree of freedom that emerges in atomically thin two-dimensional transition metal dichalcogenides (MX2). 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 MX2. Using ultrafast pump-probe spectroscopy, we observed a pure and valley-selective optical Stark effect in WSe2 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.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Ultrafast generation of pseudo-magnetic field for valley excitons in WSe2 monolayers 2014, 346 (6214):1205 Science
Publisher:
American Association for the Advancement of Science (AAAS)
Journal:
Science
Issue Date:
4-Dec-2014
DOI:
10.1126/science.1258122
ARXIV:
arXiv:1407.2347
Type:
Article
ISSN:
0036-8075; 1095-9203
Additional Links:
http://www.sciencemag.org/cgi/doi/10.1126/science.1258122; http://arxiv.org/abs/1407.2347
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorKim, J.en
dc.contributor.authorHong, X.en
dc.contributor.authorJin, C.en
dc.contributor.authorShi, S.-F.en
dc.contributor.authorChang, C.-Y. S.en
dc.contributor.authorChiu, M.-H.en
dc.contributor.authorLi, Lain-Jongen
dc.contributor.authorWang, F.en
dc.date.accessioned2015-01-20T05:58:47Z-
dc.date.available2015-01-20T05:58:47Z-
dc.date.issued2014-12-04en
dc.identifier.citationUltrafast generation of pseudo-magnetic field for valley excitons in WSe2 monolayers 2014, 346 (6214):1205 Scienceen
dc.identifier.issn0036-8075en
dc.identifier.issn1095-9203en
dc.identifier.doi10.1126/science.1258122en
dc.identifier.urihttp://hdl.handle.net/10754/338569en
dc.description.abstractThe valley pseudospin is a degree of freedom that emerges in atomically thin two-dimensional transition metal dichalcogenides (MX2). 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 MX2. Using ultrafast pump-probe spectroscopy, we observed a pure and valley-selective optical Stark effect in WSe2 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.en
dc.language.isoenen
dc.publisherAmerican Association for the Advancement of Science (AAAS)en
dc.relation.urlhttp://www.sciencemag.org/cgi/doi/10.1126/science.1258122en
dc.relation.urlhttp://arxiv.org/abs/1407.2347en
dc.rightsArchived with thanks to Scienceen
dc.titleUltrafast generation of pseudo-magnetic field for valley excitons in WSe2 monolayersen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalScienceen
dc.eprint.versionPost-printen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
dc.identifier.arxividarXiv:1407.2347en
kaust.authorLi, Lain-Jongen
kaust.authorChiu, Ming-Huien
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