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Article: Valley polarization in MoS2 monolayers by optical pumping

TitleValley polarization in MoS2 monolayers by optical pumping
Authors
KeywordsChemical analysis
Devices
Electron
Electronics
Energy
Issue Date2012
PublisherNature Publishing Group.
Citation
Nature Nanotechnology, 2012, v. 7, p. 490-493 How to Cite?
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
Persistent Identifierhttp://hdl.handle.net/10722/164496
ISSN
2014 Impact Factor: 34.048
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZeng, Hen_US
dc.contributor.authorDai, Jen_US
dc.contributor.authorYao, Wen_US
dc.contributor.authorXiao, Den_US
dc.contributor.authorCui, Xen_US
dc.date.accessioned2012-09-20T08:00:34Z-
dc.date.available2012-09-20T08:00:34Z-
dc.date.issued2012en_US
dc.identifier.citationNature Nanotechnology, 2012, v. 7, p. 490-493en_US
dc.identifier.issn1748-3387-
dc.identifier.urihttp://hdl.handle.net/10722/164496-
dc.descriptionLetters-
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.languageengen_US
dc.publisherNature Publishing Group.en_US
dc.relation.ispartofNature Nanotechnologyen_US
dc.subjectChemical analysis-
dc.subjectDevices-
dc.subjectElectron-
dc.subjectElectronics-
dc.subjectEnergy-
dc.titleValley polarization in MoS2 monolayers by optical pumpingen_US
dc.typeArticleen_US
dc.identifier.emailZeng, H: hualingz@hku.hken_US
dc.identifier.emailDai, J: jeffdai@hku.hken_US
dc.identifier.emailYao, W: wangyao@hkucc.hku.hken_US
dc.identifier.emailCui, X: xdcui@hku.hken_US
dc.identifier.authorityYao, W=rp00827en_US
dc.identifier.authorityCui, X=rp00689en_US
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1038/nnano.2012.95-
dc.identifier.pmid22706701-
dc.identifier.scopuseid_2-s2.0-84864881664-
dc.identifier.hkuros205788en_US
dc.identifier.volume7en_US
dc.identifier.spage490en_US
dc.identifier.epage493en_US
dc.identifier.eissn1748-3395-
dc.identifier.isiWOS:000307359600006-
dc.publisher.placeUnited Kingdom-

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