Article: Valley polarization in MoS2 monolayers by optical pumping

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- Dr Cui, Xiaodong
- Dr Yao, Wang

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Publisher Website: 10.1038/nnano.2012.95
Scopus: eid_2-s2.0-84864881664
PMID: 22706701

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Title	Valley polarization in MoS2 monolayers by optical pumping
Authors	Zeng, H1 Dai, J3 Yao, W1 Xiao, D2 Cui, X1
Keywords	Chemical analysis Devices Electron Electronics Energy
Issue Date	2012
Publisher	Nature Publishing Group.
Citation	Nature Nanotechnology, 2012, v. 7, p. 490-493 [How to Cite?] DOI: http://dx.doi.org/10.1038/nnano.2012.95
Abstract	Most 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.
Description	Letters
ISSN	1748-3387 2011 Impact Factor: 27.27 2011 SCImago Journal Rankings: 5.519
DOI	http://dx.doi.org/10.1038/nnano.2012.95

DC Field	Value
dc.contributor.author	Zeng, H
dc.contributor.author	Dai, J
dc.contributor.author	Yao, W
dc.contributor.author	Xiao, D
dc.contributor.author	Cui, X
dc.date.accessioned	2012-09-20T08:00:34Z
dc.date.available	2012-09-20T08:00:34Z
dc.date.issued	2012
dc.description.abstract	Most 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.nature	Link_to_subscribed_fulltext
dc.description	Letters
dc.identifier.citation	Nature Nanotechnology, 2012, v. 7, p. 490-493 [How to Cite?] DOI: http://dx.doi.org/10.1038/nnano.2012.95
dc.identifier.doi	http://dx.doi.org/10.1038/nnano.2012.95
dc.identifier.epage	493
dc.identifier.hkuros	205788
dc.identifier.issn	1748-3387 2011 Impact Factor: 27.27 2011 SCImago Journal Rankings: 5.519
dc.identifier.pmid	22706701
dc.identifier.scopus	eid_2-s2.0-84864881664
dc.identifier.spage	490
dc.identifier.uri	http://hdl.handle.net/10722/164496
dc.identifier.volume	7
dc.language	eng
dc.publisher	Nature Publishing Group.
dc.publisher.place	United Kingdom
dc.relation.ispartof	Nature Nanotechnology
dc.subject	Chemical analysis
dc.subject	Devices
dc.subject	Electron
dc.subject	Electronics
dc.subject	Energy
dc.title	Valley polarization in MoS2 monolayers by optical pumping
dc.type	Article

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Author Affiliations

The University of Hong Kong
Oak Ridge National Laboratory
University of Science and Technology of China

Article: Valley polarization in MoS2 monolayers by optical pumping

The HKU Scholars Hub has contact details for these author(s).