中文版 | English
Title

Valley polarization in MoS2 monolayers by optical pumping

Author
Corresponding AuthorCui, Xiaodong
Publication Years
2012-08
DOI
Source Title
ISSN
1748-3387
EISSN
1748-3395
Volume7Issue:8Pages:490-493
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(1,2). 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(3-5). To make a valleytronic device it is necessary to control the number of electrons in these valleys, thereby producing a valley polarization(6-11). Single-layer MoS2 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(12). Here, we demonstrate that optical pumping with circularly polarized light can achieve a valley polarization of 30% in pristine monolayer MoS2. Our results, and similar results by Mak et al.(13), demonstrate the viability of optical valley control and valley-based electronic and optoelectronic applications in MoS2 monolayers.
URL[Source Record]
Indexed By
SCI ; EI
Language
English
Funding Project
University Grant Council government of HKSAR[AoE/P-04/08] ; University Grant Council government of HKSAR[SEG_CUHK06]
WOS Research Area
Science & Technology - Other Topics ; Materials Science
WOS Subject
Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS Accession No
WOS:000307359600006
Publisher
EI Accession Number
20192907185953
EI Keywords
Electron devices ; Electrons ; Layered semiconductors ; Molybdenum compounds ; Monolayers ; Optical pumping ; Polarization
ESI Classification Code
Geology:481.1
Important Publications
NI Journal Papers
SUSTech Authorship
Others
ESI Research Field
MATERIALS SCIENCE
Data Source
Web of Science
Citation statistics
Cited Times [WOS]:2065
Document TypeJournal Article
Identifierhttps://kc.sustech.edu.cn/handle/2SGJ60CL/30420
DepartmentDepartment of Physics
Affiliation
1.Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China
2.S Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China
3.Univ Hong Kong, Ctr Theoret & Computat Phys, Hong Kong, Hong Kong, Peoples R China
4.Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
Recommended Citation
GB/T 7714
Zeng, Hualing,Dai, Junfeng,Yao, Wang,et al. Valley polarization in MoS2 monolayers by optical pumping[J]. NATURE NANOTECHNOLOGY,2012,7(8):490-493.
APA
Zeng, Hualing,Dai, Junfeng,Yao, Wang,Xiao, Di,&Cui, Xiaodong.(2012).Valley polarization in MoS2 monolayers by optical pumping.NATURE NANOTECHNOLOGY,7(8),490-493.
MLA
Zeng, Hualing,et al."Valley polarization in MoS2 monolayers by optical pumping".NATURE NANOTECHNOLOGY 7.8(2012):490-493.
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