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Article: Valley polarization in MoS2 monolayers by optical pumping
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TitleValley polarization in MoS2 monolayers by optical pumping
 
AuthorsZeng, H1
Dai, J3
Yao, W1 1
Xiao, D2
Cui, X1
 
KeywordsChemical analysis
Devices
Electron
Electronics
Energy
 
Issue Date2012
 
PublisherNature Publishing Group.
 
CitationNature Nanotechnology, 2012, v. 7, p. 490-493 [How to Cite?]
DOI: http://dx.doi.org/10.1038/nnano.2012.95
 
AbstractMost electronic devices exploit the electric charge of electrons, but it is also possible to build devices that rely on other properties of electrons. Spintronic devices, for example, make use of the spin of electrons. Valleytronics is a more recent development that relies on the fact that the conduction bands of some materials have two or more minima at equal energies but at different positions in momentum space. To make a valleytronic device it is necessary to control the number of electrons in these valleys, thereby producing a valley polarization. Single-layer MoS(2) is a promising material for valleytronics because both the conduction and valence band edges have two energy-degenerate valleys at the corners of the first Brillouin zone. Here, we demonstrate that optical pumping with circularly polarized light can achieve a valley polarization of 30% in pristine monolayer MoS(2). Our results, and similar results by Mak et al., demonstrate the viability of optical valley control and valley-based electronic and optoelectronic applications in MoS(2) monolayers.
 
DescriptionLetters
 
ISSN1748-3387
2012 Impact Factor: 31.17
2012 SCImago Journal Rankings: 13.246
 
DOIhttp://dx.doi.org/10.1038/nnano.2012.95
 
DC FieldValue
dc.contributor.authorZeng, H
 
dc.contributor.authorDai, J
 
dc.contributor.authorYao, W
 
dc.contributor.authorXiao, D
 
dc.contributor.authorCui, X
 
dc.date.accessioned2012-09-20T08:00:34Z
 
dc.date.available2012-09-20T08:00:34Z
 
dc.date.issued2012
 
dc.description.abstractMost electronic devices exploit the electric charge of electrons, but it is also possible to build devices that rely on other properties of electrons. Spintronic devices, for example, make use of the spin of electrons. Valleytronics is a more recent development that relies on the fact that the conduction bands of some materials have two or more minima at equal energies but at different positions in momentum space. To make a valleytronic device it is necessary to control the number of electrons in these valleys, thereby producing a valley polarization. Single-layer MoS(2) is a promising material for valleytronics because both the conduction and valence band edges have two energy-degenerate valleys at the corners of the first Brillouin zone. Here, we demonstrate that optical pumping with circularly polarized light can achieve a valley polarization of 30% in pristine monolayer MoS(2). Our results, and similar results by Mak et al., demonstrate the viability of optical valley control and valley-based electronic and optoelectronic applications in MoS(2) monolayers.
 
dc.description.natureLink_to_subscribed_fulltext
 
dc.descriptionLetters
 
dc.identifier.citationNature Nanotechnology, 2012, v. 7, p. 490-493 [How to Cite?]
DOI: http://dx.doi.org/10.1038/nnano.2012.95
 
dc.identifier.doihttp://dx.doi.org/10.1038/nnano.2012.95
 
dc.identifier.eissn1748-3395
 
dc.identifier.epage493
 
dc.identifier.hkuros205788
 
dc.identifier.issn1748-3387
2012 Impact Factor: 31.17
2012 SCImago Journal Rankings: 13.246
 
dc.identifier.pmid22706701
 
dc.identifier.scopuseid_2-s2.0-84864881664
 
dc.identifier.spage490
 
dc.identifier.urihttp://hdl.handle.net/10722/164496
 
dc.identifier.volume7
 
dc.languageeng
 
dc.publisherNature Publishing Group.
 
dc.publisher.placeUnited Kingdom
 
dc.relation.ispartofNature Nanotechnology
 
dc.subjectChemical analysis
 
dc.subjectDevices
 
dc.subjectElectron
 
dc.subjectElectronics
 
dc.subjectEnergy
 
dc.titleValley polarization in MoS2 monolayers by optical pumping
 
dc.typeArticle
 
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<contributor.author>Dai, J</contributor.author>
<contributor.author>Yao, W</contributor.author>
<contributor.author>Xiao, D</contributor.author>
<contributor.author>Cui, X</contributor.author>
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Author Affiliations
  1. The University of Hong Kong
  2. Oak Ridge National Laboratory
  3. University of Science and Technology of China