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