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    Defect Structure of Localized Excitons in a WSe2 Monolayer

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    PhysRevLett.119.046101.pdf
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    Type
    Article
    Authors
    Zhang, Shuai
    Wang, Chen-Guang
    Li, Ming-yang cc
    Huang, Di
    Li, Lain-Jong cc
    Ji, Wei
    Wu, Shiwei
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2017-07-25
    Permanent link to this record
    http://hdl.handle.net/10754/625331
    
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    Abstract
    The atomic and electronic structure of intrinsic defects in a WSe2 monolayer grown on graphite was revealed by low temperature scanning tunneling microscopy and spectroscopy. Instead of chalcogen vacancies that prevail in other transition metal dichalcogenide materials, intrinsic defects in WSe2 arise surprisingly from single tungsten vacancies, leading to the hole (p-type) doping. Furthermore, we found these defects to dominate the excitonic emission of the WSe2 monolayer at low temperature. Our work provided the first atomic-scale understanding of defect excitons and paved the way toward deciphering the defect structure of single quantum emitters previously discovered in the WSe2 monolayer.
    Citation
    Zhang S, Wang C-G, Li M-Y, Huang D, Li L-J, et al. (2017) Defect Structure of Localized Excitons in a WSe2 Monolayer. Physical Review Letters 119. Available: http://dx.doi.org/10.1103/PhysRevLett.119.046101.
    Sponsors
    The work at Fudan was supported by the National Basic Research Program of China (No. 2014CB921601 and No. 2016YFA0301002), the National Natural Science Foundation of China (No. 91421108 and No. 11427902), and the Science and Technology Commission of Shanghai Municipality (16JC1400401). C.-G.W. and W.J. acknowledge support from the National Natural Science Foundation of China (NSFC) under Grants No. 61674171, No. 11274380, No. 91433103, and No. 11622437, the Fundamental Research Funds for the Central Universities, and the Research Funds of Renmin University of China under Grant No. 16XNLQ01. C.-G.W. was supported by the Outstanding Innovative Talents Cultivation Funded Programs of Renmin University of China. The calculations were performed at the Physics Laboratory for High-Performance Computing of Renmin University of China and at the Shanghai Supercomputer Center. L. J. L. acknowledges the support from King Abdullah University of Science and Technology and Academia Sinica Taiwan.
    Publisher
    American Physical Society (APS)
    Journal
    Physical Review Letters
    DOI
    10.1103/PhysRevLett.119.046101
    Additional Links
    https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.119.046101
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevLett.119.046101
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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