Electrostatic Potential of hBN Moiré Superlattices

ORAL

Abstract

Twisted hexagonal boron nitride (hBN) layers have been demonstrated to exhibit ferroelectric domains due to charge redistribution at the interface. Here, we investigate the electrostatic potential at the top surface of twisted hBN bilayers, prepared by folding exfoliated thin flakes. Using Kelvin Probe Force Microscopy measurements, we show that this potential can be engineered by tuning the twist angle and adjusting the thickness of the top hBN layer. Furthermore, we study double moiré superlattices with different twist angles at each interface. These findings can be further extended to twisted multilayers to significantly expand the versatility of hBN and moiré superlattices in engineering material properties.

*We gratefully acknowledge funding from Air Force Office of Scientific Research under award FA2386-21-1-4067, National Science Foundation via grants DMR-1720595, ECCS-2130552, DMR-2122041, DMR-2044920, DMR-2117438, DMR-2118806, DMR-2118779, DMR-1720595, DMR-2019130, Department of Energy, Office of Basic Sciences under DE-SC0019398, Welch Foundation under grant F-1662, JSPS KAKENHI under grants 19H05790, 20H00354, 21H05233, RGC of HKSAR under grant HKU SRFS2122-7S05 and Croucher Foundation.

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Presenters

  • Dong Seob Kim

    • University of Texas at Austin

Authors

  • Dong Seob Kim

    • University of Texas at Austin

  • Rigo Mayorga-Luna

    • Texas State University

  • Dingyi Ye

    • Washington University, St. Louis

  • Tixuan Tan

    • University of Hong Kong

  • Yue Ni

    • University of Texas at Austin

  • Zhida Liu

    • University of Texas at austin

  • Roy C Dominguez

    • Texas State University

  • Mitchell T Ford

    • Texas State University

  • Frank Y Gao

    • University of Texas at Austin

  • Saba Arash

    • University of Texas at Austin

  • 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

  • Suenne Kim

    • Hanyang University

  • Chih-Kang Shih

    • University of Texas at Austin

  • Keji Lai

    • University of Texas at Austin

  • Wang Yao

    • The University of Hong Kong

  • Li Yang

    • Washington University, St. Louis

  • Xiaoqin Elaine Li

    • University of Texas at Austin

  • Yoichi Miyahara

    • Texas State University