Twist-angle dependent optical properties of interlayer excitons in MoSe<sub>2</sub>/WSe<sub>2</sub> heterostructures

ORAL

Abstract

We investigate the interlayer excitons in MoSe2/WSe2 heterostructures, mechanically stacked with an accurately controlled twist angle and capsulated by hexagonal boron nitride. Three R-stacking style samples with different twist angles are measured by polarization-resolved steady state and time-resolved photoluminescence at low-temperature. We observe multiple resonances of interlayer excitons which we attribute to quantized states in the moiré potential. The recombination dynamics of the interlayer excitons are found to change significantly with a small change in the twist angle.

*We gratefully acknowledge funding from NSF DMR-1720595, NSF DMR-1808042, and Welch Foundation F-1662.

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Presenters

  • Junho Choi

    • Physics, University of Texas at Austin
    • University of Texas at Austin
    • Department of Physics, Complex Quantum Systems, and Texas Materials Institutes, University of Texas at Austin

Authors

  • Junho Choi

    • Physics, University of Texas at Austin
    • University of Texas at Austin
    • Department of Physics, Complex Quantum Systems, and Texas Materials Institutes, University of Texas at Austin

  • Kha Tran

    • Department of Physics, Complex Quantum Systems, and Texas Materials Institutes, University of Texas at Austin

  • Galan Moody

    • Department of Electrical and Computer Engineering, University of California Santa Barbara

  • Akshay K Singh

    • Department of Materials Science and Engineering, Massachusetts Institute of Technology

  • Jiamin Quan

    • Physics, University of Texas at Austin
    • Department of Physics, The University of Texas at Austin
    • University of Texas at Austin
    • Department of Physics, Complex Quantum Systems, and Texas Materials Institutes, University of Texas at Austin

  • Liuyang Sun

    • Department of Physics, Complex Quantum Systems, and Texas Materials Institutes, University of Texas at Austin

  • Rob Claassen

    • Department of Physics, Complex Quantum Systems, and Texas Materials Institutes, University of Texas at Austin

  • Carter Young

    • Department of Physics, University of Texas at Austin
    • University of Texas at Austin
    • Department of Physics, Complex Quantum Systems, and Texas Materials Institutes, University of Texas at Austin

  • Takashi Taniguchi

    • National Institute for Materials Science, Japan
    • National Institute for Material Science
    • National Institute for Materials Science
    • National Institute for Materials Science, Tsukuba
    • Research Center for Functional Materials, NIMS
    • nims
    • Advanced Materials Laboratory, National Institute for Materials Science
    • National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • NIMS
    • National Institute for Material Science - Japan
    • NIMS Tsukuba
    • National Institute for Materials Science, Namiki 1-1, Ibaraki 305-0044, Japan.
    • National Institute for Materials Science (NIMS)
    • National Institute for Materials Science,Tsukuba, Ibaraki 305-0047, Japan
    • Advanced Materials Laboratory, NIMS, Japan
    • National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan
    • National Institute of Materials Science
    • National Institute for Materials Science, University of Tsukuba
    • National Institute for Materials Science, Tsukuba, Japan
    • National Institue for Material Science, Tsukuba
    • Advanced Materials Laboratory, NIMS
    • Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba 305-0044, Japan
    • Advanced Matrials Lab, NIMS
    • National Institute for Material Science, Tsukuba, Japan
    • National institute for materials science
    • NIMS-Tsukuba
    • NIMS, Japan
    • National Institute for Materials Science, Namiki Tsukuba Ibaraki, Japan
    • Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan
    • National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki, Japan
    • Advanced Materials Laboratory, National Institute of Materials Science
    • Advanced Materials Laboratory, National Institute for Materials Science 1-1 Namiki, Tsukuba, 305-0044, Japan
    • National Institute of Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science (Japan)
    • Physics, NIMS
    • National Institute of Materials Science, Japan
    • National Institute of Materials Science, Tsukuba, Ibaraki 305-0044, Japan
    • NIMS - Tsukuba

  • Kenji Watanabe

    • National Institute for Materials Science, Japan
    • National Institute for Material Science
    • National Institute for Materials Science
    • National Institute for Materials Science, Tsukuba
    • Research Center for Functional Materials, NIMS
    • nims
    • Advanced Materials Laboratory, National Institute for Materials Science
    • National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • NIMS
    • National Institute for Material Science - Japan
    • NIMS Tsukuba
    • National Institute for Materials Science, Namiki 1-1, Ibaraki 305-0044, Japan.
    • National Institute for Materials Science (NIMS)
    • National Institute for Materials Science,Tsukuba, Ibaraki 305-0047, Japan
    • Advanced Materials Laboratory, NIMS, Japan
    • National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan
    • National Institute of Materials Science
    • National Institute for Materials Science, University of Tsukuba
    • National Institute for Materials Science, Tsukuba, Japan
    • National Institute for Material Science, Japan
    • National Institue for Material Science, Tsukuba
    • Advanced Materials Laboratory, NIMS
    • Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba 305-0044, Japan
    • Advanced Matrials Lab, NIMS
    • National Institute for Material Science, Tsukuba, Japan
    • National institute for materials science
    • NIMS-Tsukuba
    • NIMS, Japan
    • National Institute for Materials Science, Namiki Tsukuba Ibaraki, Japan
    • NIRM
    • Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan
    • National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki, Japan
    • Advanced Materials Laboratory, National Institute of Materials Science
    • Advanced Materials Laboratory, National Institute for Materials Science 1-1 Namiki, Tsukuba, 305-0044, Japan
    • National Institute of Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science (Japan)
    • Physics, NIMS
    • National Institute of Materials Science, Japan
    • National Institute of Materials Science (NIMS)
    • National Institute of Materials Science, Tsukuba, Ibaraki 305-0044, Japan
    • NIMS - Tsukuba

  • Xiaoqin (Elaine) Li

    • Physics, University of Texas at Austin
    • Department of Physics, The University of Texas at Austin
    • Department of Physics, University of Texas at Austin
    • University of Texas at Austin
    • Department of Physics, Complex Quantum Systems, and Texas Materials Institutes, University of Texas at Austin