Quantum Transport in Bismuth Two-dimensional Electron System

ORAL

Abstract

Two-dimensional electron systems (2DESs) have represented an ever-expanding frontier in condensed matter physics. Over the past two decades, this growth has primarily been propelled by the emergence of novel 2DESs, exemplified by graphene and other two-dimensional crystals, each demonstrating distinctive properties. In this talk, I'll present our recent observation of a high-mobility 2DES on the surface of thin bismuth crystal, which we synthesize via van der Waals epitaxy on hexagonal boron nitride (hBN) flakes. The bismuth 2DES is characterized by its strong spin-orbit coupling (SOC) and harbors both electrons and holes. The simultaneous presence of both carrier types offers a unique opportunity to study the interplay between electron and hole states in the extreme quantum limit; we observe clear signs of charge migration between these states under strong external magnetic fields up to 40 Tesla. The strong magnetic field additionally reveals symmetry breaking in bismuth 2DES, which manifests as splitting of the hole levels. These findings open the door for further exploring potential topological quantum effects in this strongly spin-orbit coupled, high mobility 2DES.

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Presenters

  • Di Yue

    • Fudan University

Authors

  • Di Yue

    • Fudan University

  • Hongya Wang

    • Fudan University

  • Guangyi Huang

    • Fudan University

  • Yadong Jiang

    • Fudan University

  • Zhiwei Huang

    • Fudan University

  • Pengyu Zheng

    • Fudan University

  • Yichen Song

    • Fudan University

  • Shuaifei Guo

    • Fudan University

  • Ning Tian

    • Fudan University

  • Mingyan Luo

    • Fudan University

  • Zhongxun Guo

    • Fudan University

  • Hengsheng Luo

    • Fudan University

  • Chuanying Xi

    • Chinese Academy of Sciences
    • Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, Chinese Academy of Sciences

  • Guangli Kuang

    • Chinese Academy of Sciences
    • Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, Chinese Academy of Sciences

  • Kenji Watanabe

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

  • Takashi Taniguchi

    • National Institute for Materials Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute of Material Science, Tsukuba, Japan
    • Advanced Materials Laboratory, National Institute for Materials Science

  • Jing Wang

    • Fudan University

  • Changlin Zheng

    • Fudan University

  • Xiaofeng Jin

    • Fudan University

  • Wei Ruan

    • Fudan University
    • Fudan Univ

  • Yuanbo Zhang

    • Fudan University
    • Fudan Univ