Observation of quadrupolar and dipolar excitons in a semiconductor heterotrilayer

ORAL

Abstract

We report the observation of quadrupolar and dipolar excitons in a semiconductor heterotrilayer consisting of stacked, angle-aligned WSe2/WS2/WSe2 monolayers. Characteristics of the quadrupolar excitons are manifested in tunable dipole moments under an external electric field, a decrease in exciton energy of 12 meV from coherent hole tunneling between the two outer layers, and suppressed exciton-exciton interactions. At high exciton density, we also see signatures of a phase of staggered dipolar excitons, which is driven by the attractive interaction between oppositely aligned static dipole moments of dipolar interlayer excitons.

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Presenters

  • Leo Yu

    • Stanford University

Authors

  • Leo Yu

    • Stanford University

  • Kateryna Pistunova

    • Stanford Univ

  • Jenny Hu

    • Stanford University
    • Stanford Univ

  • Kenji Watanabe

    • National Institute for Materials Science
    • Research Center for Functional Materials, National Institute of Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • NIMS
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • Takashi Taniguchi

    • National Institute for Materials Science
    • Kyoto Univ
    • International Center for Materials Nanoarchitectonics, National Institute of Materials Science
    • Kyoto University
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • National Institute For Materials Science
    • NIMS
    • National Institute for Material Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • Tony F Heinz

    • Stanford University
    • SLAC National Accelerator Laboratory