Luminescent Emission from 1<i>s</i>, 2<i>s</i>, 3<i>s</i> and 4<i>s</i> Excitons of Monolayer WSe<sub>2</sub> in High Magnetic Fields

ORAL

Abstract

The strong Coulomb interaction in 2D-TMDCs provides an outstanding platform for investigating the Rydberg exciton physics. In this study, we observed for the first time excitonic luminescence of up to the 4s excited state in ultrahigh quality BN/1L-WSe2/BN heterostructures in a strong out-of-plane magnetic field. By analyzing the diamagnetic shift of the ground and excited exciton states, the radii of the 2s and 3s excitons are found to be 3.4 and 6 times larger comparing with the 1s exciton. Moreover, the Zeeman splitting measurement shows the monotonic increase of g factor from -4.4 to -4.8 for 1s to 3s, indicating existence of nontrivial differences of magnetic moment and effective mass between different Rydberg exciton states. Complementary to PLE and absorption measurements in literature, our results provide an alternative method to optically investigate tightly-bound electron-hole pairs and strong Coulomb interaction in 2D excitonic systems.

*NSF ECCS-1509599

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Presenters

  • Shao-Yu Chen

    • Physics, Univ of Mass - Amherst

Authors

  • Shao-Yu Chen

    • Physics, Univ of Mass - Amherst

  • Zhengguang Lu

    • National High Magnetic Field Laboratory
    • Florida State Universtiy
    • Physics, Florida State University
    • Natl High Magnetic Field Lab
    • NHMFL, FSU

  • Thomas Goldstein

    • Physics, Univ of Mass - Amherst

  • Kenji Watanabe

    • National Institute for Materials Science
    • NIMS
    • National Institute for Material Science
    • Advanced Materials Laboratory, National Institute for Materials Science
    • National Institute of Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science (NIMS
    • Advanced Materials Laboratory, NIMS
    • National Institute for Materials Science, Advanced Materials Laboratory
    • National Institue for Materials Science
    • National Institute of Material Science
    • National Institute for Matericals Science
    • Advanced Materials Laboratory
    • National Institute for Materials Science, 1-1 Namiki
    • Advanced materials laboratory, National institute for Materials Science
    • NIMS-Japan

  • Takashi Taniguchi

    • National Institute for Materials Science
    • NIMS
    • National Institute for Material Science
    • Advanced Materials Laboratory, National Institute for Materials Science
    • National Institute of Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science (NIMS
    • Advanced Materials Laboratory, NIMS
    • National Institute for Materials Science, Advanced Materials Laboratory
    • National Institue for Materials Science
    • National Institute of Material Science
    • National Institute for Matericals Science
    • Advanced Materials Laboratory
    • National Institute for Materials Science, 1-1 Namiki
    • NIMS-Japan

  • Dmitry Smirnov

    • 1800 East Paul Dirac Drive, Natl High Magnetic Field Lab
    • Natl High Magnetic Field Lab
    • National High Magnetic Field Laboratory
    • NHMFL
    • Condensed Matter Science, National High Magnetic Field Laboratory
    • NHMFL, FSU

  • Jun Yan

    • Physics, Univ of Mass - Amherst
    • Univ of Mass - Amherst