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Interlayer exciton structure and moiré-localization revealed by time- and angle-resolved photoemission spectroscopy

ORAL

Abstract

Heterobilayers made by stacking two monolayers of transition-metal dichalcogenide semiconductors feature a moiré pattern that spatially modulates the electronic band-structure, and with it the energies of interlayer excitons (ILXs) – electron-hole pairs bound across the interlayer gap. It is thus expected to confine ILXs in the moiré potential wells. In this talk, I will present a quantitative analysis of this effect in the MoS2/WSe2 heterobilayer based on time- and angle-resolved photoemission spectroscopy measurements that reveal separately momentum-images of the electron and hole components of the ILX. Aided by theoretical analysis of the photoemission signatures, we extract the real-space structure of the ILX wavefunction, including both its size and its surprisingly strong center-of-mass localization by the moiré potential. This information is fundamental to understanding interactions between moiré-localized ILXs and their potential as single-photon emitters.

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Publication: O. Karni et al. arxiv 2108.01933

Presenters

  • Ouri Karni

    Stanford University

Authors

  • Ouri Karni

    Stanford University

  • Elyse Barre

    Stanford Univ, Stanford University

  • Vivek Pareek

    Okinawa Institute of Science & Technolog

  • Michael K Man

    Okinawa Institute of Science and Technology

  • Johnathan D Georgaras

    Stanford University

  • Chakradhar Sahoo

    Okinawa Institute of Science & Technology

  • David R Bacon

    Okinawa institute of science and technology

  • Xing Zhu

    Okinawa Institute of Science and Technology

  • Henrique B Ribeiro

    Stanford University

  • Aidan O'Beirne

    Stanford Univ

  • Jenny Hu

    Stanford Univ

  • Abdullah Al-Mahboob

    Okinawa Institute of Science and Technology Graduate University, Okinawa Institute of Science and Technology

  • Mohamed M M. M. Abdelrasoul

    Okinawa Institute of Technology

  • Nicholas S Chan

    Okinawa Institute of Science and Technology

  • Arka Karmakar

    Okinawa Institute of Science and Technology

  • Andrew Winchester

    Okinawa Institute of Science & Technology

  • Bumho Kim

    Columbia University

  • Kenji Watanabe

    National Institute for Materials Science, Tsukuba, Japan, National Institute for Materials Science, NIMS, Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan, Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan., Research Center for Functional Materials, National Institute for Materials Science, Advanced, Materials Laboratory, NIMS, 3 National Institute for Materials Science, Tsukuba, Japan, National Institute for Materials Science; 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan, National Institute of Materials Science, Tsukuba, Japan, National Institute of Materials Science, Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan, National Institute for Materials Science (Japan), National Institute for Materials Science, Japan, Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, Research Center for Functional Materials, Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan, Research Center for Functional Materials, National Institute for Materials Science, Japan, Research Center for Functional Materials, National Institute for Materials Science, 1-1Namiki, Tsukuba 305-0044, Japan, National Institute for Material Science, Japan, National Institute for Material Science, National Institute of Material Sciences, Japan, NIMS, Tsukuba, 2National Institute for Materials Science, Namiki 1-1, Ibaraki 305-0044, Japan., National Institute of Materials Science, Tsukuba, Ibaraki 305-0044, Japan, National Institute for Materials Science Japan, NIMS, Japan, nims, National Institute for Materials Science, Research Center for Functional Materials, Japan, National Institute for Materials Science Tsukuba, National Institute for Materials Science, 1-1 Namiki, National Institute for Materials Science of Japan, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, NIMS - National Institute for Material Science, Japan, Research Center for Functional Materials, National Institute for Material Science, Tsukuba, Ibaraki, 305-0044, Japan., National Institute for Material Science, Tsukuba, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan, National Institute for Materials Science (NIMS), National Institute for Materials Science, Research Center for Functional Materials, Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan, National Institute of Material Science, Kyoto Univ, National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan

  • Takashi Taniguchi

    National Institute for Materials Science, Tsukuba, Japan, National Institute for Materials Science, NIMS, Kyoto Univ, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Ibaraki 305-0044, Japan., 3 National Institute for Materials Science, Tsukuba, Japan, National Institute for Materials Science; 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan, National Institute of Materials Science, Tsukuba, Japan, National Institute of Materials Science, Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan, National Institute for Materials Science (Japan), International Center for Materials Nanoarchitectonics, National Institute for Materials Science, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, Kyoto University, International Center for Materials Nanoarchitectonics, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Japan, International Center for Materials Nanoarchitectonics, National Institute for MaterialsScience, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Material Science, Japan, National Institute for Material Science, National Institute of Material Sciences, Japan, NIMS, Tsukuba, 2National Institute for Materials Science, Namiki 1-1, Ibaraki 305-0044, Japan., National Institute of Materials Science, Tsukuba, Ibaraki 305-0044, Japan, National Institute for Materials Science, Japan, International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan., NIMS, Japan, National Institute for Materials Science (NIMS), NIMS. Japan, International Center for Material Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan, International Center for Material Nanoarchitectonics, National Institute for Materials Science, National Institute for Materials Science Tsukuba, National Institute for Materials Science, 1-1 Namiki, National Institute for Materials Science of Japan, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, NIMS - National Institute for Material Science, Japan, International Center for Materials Nanoarchitectonics, National Institute for Material Science, Tsukuba, Ibaraki 305-0044, Japan., National Institute for Material Science, Tsukuba, National Institute for Materials Science, International Center for Materials Nanoarchitectonics, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan, National Institute of Material Science, National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan

  • Katayun Barmak

    Columbia Univ, Columbia University

  • Julien Madeo

    Okinawa Institute of Science and Technology

  • Felipe H da Jornada

    Stanford Univ, Stanford University

  • Tony F Heinz

    Stanford University

  • Keshav M Dani

    Okinawa Institute of Science & Technology