Localized excitons in a proximitized moiré lattice

POSTER

Abstract

We report the observation of localized excitons in a monolayer MoSe2 when placed in the proximity of a moiré lattice formed via twisted hBN layers. When hBN is twisted with a small angle, it forms a moiré pattern with alternating potential domains at the interface. This potential difference can be used to control the properties of excitons located on the surface of the hBN. We demonstrate this effect by placing a monolayer of MoSe2 on the twisted hBN with varying twist angles. The presence of the underlying moiré potential results in the photoluminescence of excitons in MoSe2 blue shifting indicative of confinement effect. Using a Kelvin probe force microscope(KPFM), we observed potential modulation on the MoSe2 of ~ 40 meV at 4K.

*AFOSR Global: FA2386-21-1-4087; NRF: 2021K1A3A1A32084700

Presenters

  • Minhyun Cho

    • Kyung Hee University

Authors

  • Minhyun Cho

    • Kyung Hee University

  • Biswajit Datta

    • City College of New York

  • Kwanghee Han

    • Kyung Hee University

  • Saroj B Chand

    • ASRC CUNY

  • Pratap C Adak

    • City College of New York

  • Sichao Yu

    • City College of New York
    • The City University of New York

  • Kenji Watanabe

    • National Institute for Materials Science
    • NIMS
    • Research Center for Electronic and Optical Materials, National Institute for Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science

  • Takashi Taniguchi

    • Kyoto Univ
    • National Institute for Materials Science
    • Research Center for Materials Nanoarchitectonics
    • Research Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • National Institute for Materials Sciences
    • NIMS
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science
    • International Center for Materials Nanoarchitectonics, NIMS, Japan
    • International Center for Materials Nanoarchitectonics, Tsukuba
    • National Institue for Materials Science
    • Kyoto University
    • National Institute of Materials Science
    • International Center for Materials Nanoarchitectonics and National Institute for Materials Science

  • James C Hone

    • Columbia University

  • Gabriele Grosso

    • ASRC CUNY

  • Young Duck Kim

    • Kyung Hee University

  • Vinod M Menon

    • City College of New York