Interlayer Excitons in a MoSe<sub>2</sub>/WSe<sub>2</sub> Monolayer Heterostructure

ORAL

Abstract

We investigate low temperature photoluminescence of interlayer excitons in hexagonal boron nitride (hBN) encapsulated monolayer MoSe2 and WSe2 vertical heterostructure. Surprisingly, we find the interlayer exciton splits into four different resonances at 1305 meV, 1340 meV, 1360 meV, and 1387 meV. All four resonances exhibit long photoluminescence lifetimes of hundred nanoseconds, which verify their interlayer nature. Based on the temperature and excitation power dependence, we tentatively assign the lower energy resonances, 1305 meV and 1340 meV resonances to be indirect and direct interlayer exciton in the momentum space, respectively.

*We gratefully acknowledge funding from NSF DMR-1720595, EFMA-1542747, and Welch Foundation F-1662.

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Presenters

  • Kha Tran

    • Department of Physics, Univerisity of Texas at Austin
    • Department of Physics, Univ of Texas, Austin

Authors

  • Kha Tran

    • Department of Physics, Univerisity of Texas at Austin
    • Department of Physics, Univ of Texas, Austin

  • Akshay Singh

    • Department of Physics, Univ of Texas, Austin

  • Jacob Embley

    • Department of Physics, Univ of Texas, Austin

  • Junho Choi

    • Department of Physics, Univ of Texas, Austin
    • Univ of Texas, Austin

  • 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

  • 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

  • Galan Moody

    • National Institute of Standards & Technology

  • Xiaoqin (Elaine) Li

    • University of Texas at Austin
    • Department of Physics, Univerisity of Texas at Austin
    • Department of Physics, Univ of Texas, Austin
    • Univ of Texas, Austin