APS Logo

Trapping of Interlayer Excitons in MoSe2-WSe2 Heterostructures

ORAL

Abstract

MoSe2-WSe2 heterostructures are known to host long lived spatially indirect interlayer excitons composed of bound electron and hole pairs that are located in different layers. Recently there has been significant interest in spatially controlling interlayer excitons via externally applied electric fields to demonstrate excitonic currents and trapping interlayer excitons via moiré superlattices. In this presentation, I will discuss how to use patterned graphene gates in close proximity to the heterostructure to create a spatially varying electric field within the vicinity of the interlayer exciton. The interaction between permanent dipole moment of the interlayer exciton and the electric field creates a spatial potential energy trap for the excitons, which is controlled by the geometry of the patterned graphene gate as well as the externally applied voltage. I will show that these trapped interlayer excitons can be identified through spatially resolved photoluminescence imaging and gate-dependent spectroscopy. Finally, I will discuss potential applications of the trapped interlayer excitons to quantum information science applications.

–

Presenters

  • Daniel N. Shanks

    Department of Physics, University of Arizona

Authors

  • Daniel N. Shanks

    Department of Physics, University of Arizona

  • Michael R Koehler

    JIAM Diffraction Facility, Joint Institue for Advanced Materials, University of Tennessee, Joint Institute for Advanced Materials Diffraction Facility, University of Tennessee, The University of Tennessee

  • David George Mandrus

    Materials Science and Technology Division, Oak Ridge National Labratory, Materials Science and Engineering, University of Tennessee, Department of Materials Science and Engineering, University of Tennessee, University of Tennessee, Department of Materials Science and Engineering, University of Tennessee Knoxville, Department of Materials Science & Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA, Oakridge National Laboratory, Materials Science and Engineering, University of Tennessee, Knoxville, Oak Ridge National Laboratory, University of Tennessee - Knoxville, Materials Science and Technology Division, Oak Ridge National Laboratory, Department of Physics, University of Tennessee Knoxville, Materials Science and Technology, Oak Ridge National Laboratory, Oak Ridge National Laboratory, Materials Science and Technology Division, Department of Materials Science, The University of Tennessee, University of Tennessee, Knoxville

  • Takashi Taniguchi

    National Institute for Materials Science, Japan, National Institute for Materials Science, Department of Chemical Engineering, Kyoto University, National Institute for Materials Science, Tsukuba, Ibaraki, Japan, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, Materials, NIMS, International Center for Materials Anorthite, National Institute for Materials Science, Ibaraki, Japan, Kyoto University

  • Kenji Watanabe

    National Institute for Materials Science, National Institute for Materials Science, Japan, National Institure for Materials Science, Advanced Materials Laboratory, National Institute for Materials Science, NIMS, National Institute of Materials Science, National Institute for Materials Science (NIMS), Research Center for Functional Materials, National Institute for Materials Science, National Institute for Materials Science,1-1 Namiki, National Institute of Material Science, National Institute for Materials Science, Tsukuba, Japan, Research Center for Functional Materials, NIMS, National Institute of Materials Science, Tsukuba, Japan, National Institude for Materials Science, National Institute for Materials Science, Tsukuba, Ibaraki, Japan, Research Center for Functional Materials, National Institute for Materials Science, Tsukuba 305-0044, Japan, International Center for Materials Nanoarchitectonics, National Institute for Materials, NIMS - Japan, National Institute for Materials Science ,Japan, National Institute for Materials Science, Tsukuba, 305-0044, Ibaraki, Japan, National Institute for Material Science, National Institute for Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Material Science Japan, NIMS Tsukuba, National Institute for Materials Science, Research Center for Functional Materials, Japan, Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Materials Science: Namiki, Tsukuba, Ibaraki, JP, National Institue for Material Science, National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan, Materials, NIMS, Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, Research Center for Functional Materials, National In, Research Center for Functional Materials, Japan, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, International Center for Materials nanoarchtectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan, NIMS Suguba, NIMS, Tsukuba, Japan, National Institute for Materials Science, Namiki 1-1, Tsukuba, 305-0044, Ibaraki, Japan, National institute of material science, Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan, Advanced Materials Laboratory, NIMS, Research Center for Functional Materials, National Institute for Materials Science, Ibaraki, Japan, National Institute for Materials Science, Research Center for Functional Materials, National Institute of Material Science, Japan, Tsukuba, National Institute for Materials Science

  • Brian J LeRoy

    Physics, University of Arizona, Department of Physics, University of Arizona, Physics, University of Arizona, Tucson AZ, University of Arizona

  • John Schaibley

    Department of Physics, University of Arizona, Physics, University of Arizona, University of Arizona