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    Direct measurement of exciton valley coherence in monolayer WSe2

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    Type
    Article
    Authors
    Hao, Kai
    Moody, Galan
    Wu, Fengcheng
    Dass, Chandriker Kavir
    Xu, Lixiang
    Chen, Chang Hsiao
    Sun, Liuyang
    Li, Ming-yang cc
    Li, Lain-Jong cc
    MacDonald, Allan H.
    Li, Xiaoqin
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2016-02-29
    Online Publication Date
    2016-02-29
    Print Publication Date
    2016-07
    Permanent link to this record
    http://hdl.handle.net/10754/622388
    
    Metadata
    Show full item record
    Abstract
    In crystals, energy band extrema in momentum space can be identified by a valley index. The internal quantum degree of freedom associated with valley pseudospin indices can act as a useful information carrier, analogous to electronic charge or spin. Interest in valleytronics has been revived in recent years following the discovery of atomically thin materials such as graphene and transition metal dichalcogenides. However, the valley coherence time - a crucial quantity for valley pseudospin manipulation - is difficult to directly probe. In this work, we use two-dimensional coherent spectroscopy to resonantly generate and detect valley coherence of excitons (Coulomb-bound electron-hole pairs) in monolayer $WSe_{2}(refs,)$. The imposed valley coherence persists for approximately one hundred femtoseconds. We propose that the electron-hole exchange interaction provides an important decoherence mechanism in addition to exciton population recombination. This work provides critical insight into the requirements and strategies for optical manipulation of the valley pseudospin for future valleytronics applications.
    Citation
    Hao K, Moody G, Wu F, Dass CK, Xu L, et al. (2016) Direct measurement of exciton valley coherence in monolayer WSe2. Nature Physics 12: 677–682. Available: http://dx.doi.org/10.1038/nphys3674.
    Sponsors
    The theoretical and experimental collaboration is made possible by SHINES, an Energy Frontier Research Center funded by the US Derailment of Energy (DoE), Office of Science, Basic Energy-Science (BES) under award # DE-SC0012070. K.H., F.W., L.X., X.L. and A.H.M. have all received support from SHINES. Optical spectroscopy studies performed by K.H., C.K.D., L.S. and X.L. have been partially supported by NSF DMR-1306878 and Welch Foundation F-1662. A.H.M. also acknowledges support from Welch Foundation F-1473. L.J.L. is grateful for support from KAUST Saudi Arabia, Academia Sinica Taiwan, and AOARD FA23861510001 USA. C.-H.C. is grateful for support from the Ministry of Science and Technology Taiwan (MOST 104-2218-E-035-010 and 104-2628-E-035-002-MY3).
    Publisher
    Springer Nature
    Journal
    Nature Physics
    DOI
    10.1038/nphys3674
    arXiv
    1509.08810
    ae974a485f413a2113503eed53cd6c53
    10.1038/nphys3674
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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