Quantum Hall States in an Anisotropic Bulk Weyl Semimetal TaAs

ORAL

Abstract

Our study reports the two-dimensional (2D)-like Shubnikov-de Hass (SdH) oscillations accompanied by quantized Hall resistivity in the high mobility (multi-quantum layers) TaAs crystal with c- (001) sample surface. On the other hand, there is no quantum Hall (QH) plateau with the single crystal sample of a- (100) crystalline surface. Moreover, microwave photovoltage (PV) and photocurrent (Iph) present distinct 2D-like quantum oscillations and QH states with beautifully features. PV and Iph minima appear at more Landau level fillings, because the QH degeneracy is broken further. Microwave enhances the conductivity and mobility within the skin depth of the electromagnetic field, thus more QH features are observed. Thus our work shows important implications for transport studies of 3D topological materials.

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Presenters

  • Jianfeng Zhang

    • Peking University
    • International Center for Quantum Materials, Peking University

Authors

  • Jianfeng Zhang

    • Peking University
    • International Center for Quantum Materials, Peking University

  • Xiaohu Zheng

    • Peking University
    • International Center for Quantum Materials, Peking University

  • Haiwen Liu

    • Department of Physics, Beijing Normal University

  • Jian Mi

    • International Center for Quantum Materials, Peking University

  • Zhujun Yuan

    • International Center for Quantum Materials, Peking University

  • Chenglong Zhang

    • International Center for Quantum Materials, Peking University

  • Shuang Jia

    • Peking Univ
    • Physics, Peking University
    • Peking University
    • International Center for Quantum Materials, Peking University

  • Xincheng Xie

    • International Center for Quantum Materials and School of Physics, Peking University
    • Peking University
    • International Center for Quantum Materials, Peking University
    • International Center for Quantum Materials, School of Physics, Peking University
    • Peking Univ

  • Rui-Rui Du

    • Rice Univ
    • Rice University
    • International Center for Quantum Materials, Peking University
    • Peking University

  • Chi Zhang

    • Peking University
    • International Center for Quantum Materials, Peking University