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    Tightly Bound Excitons in Monolayer WSe2

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    Issue Date
    2014-07-11
    Author
    He, Keliang
    Kumar, Nardeep
    Zhao, Liang
    Wang, Zefang
    Mak, Kin Fai
    Zhao, Hui
    Shan, Jie
    Publisher
    American Physical Society
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
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    Abstract
    Exciton binding energy and excited states in monolayers of tungsten diselenide (WSe2) are investigated using the combined linear absorption and two-photon photoluminescence excitation spectroscopy. The exciton binding energy is determined to be 0.37 eV, which is about an order of magnitude larger than that in III–V semiconductor quantum wells and renders the exciton excited states observable even at room temperature. The exciton excitation spectrum with both experimentally determined one- and two-photon active states is distinct from the simple two-dimensional (2D) hydrogenic model. This result reveals significantly reduced and nonlocal dielectric screening of Coulomb interactions in 2D semiconductors. The observed large exciton binding energy will also have a significant impact on next-generation photonics and optoelectronics applications based on 2D atomic crystals.
    Description
    This is the published version. Copyright © 2014 American Physical Society
    URI
    http://hdl.handle.net/1808/19248
    DOI
    https://doi.org/10.1103/PhysRevLett.113.026803
    Collections
    • Physics and Astronomy Scholarly Works [1652]
    Citation
    He, Keliang, Nardeep Kumar, Liang Zhao, Zefang Wang, Kin Fai Mak, Hui Zhao, and Jie Shan. "Tightly Bound Excitons in Monolayer WSe 2." Phys. Rev. Lett. Physical Review Letters 113.2 (2014). http://dx.doi.org/10.1103/PhysRevLett.113.026803

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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