Revealing dissipationless chiral edge channel in magnetic topological insulator via non-local transport measurement

ORAL

Abstract

We observed quantum anomalous Hall effect (QAHE) in our 10-quintuple layer Cr-doped (BiSb)$_2$Te$_3$ film grown by MBE technique. The Hall resistance $R_{xy}$ attains quantized value of h/e$^2$ (25.8 k$\Omega$) as temperature drops below 85 mK. Unlike previous report in a thinner Cr-doped (BiSb)$_2$Te$_3$ film, a finite longitudinal resistance is found in the QAHE regime and remains non-zero up to 15 Tesla suggesting the coexistence of the chiral edge channel and certain dissipative conduction channel. From macroscopic non-local transport measurements with leads separated by few millimeters, we further identify the dissipationless nature of the chiral edge channel associated with the QAHE. Detailed T-dependence and field-dependence of the non-local signals will be presented and discussed.

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Authors

  • Wei-Li Lee

    • Academia Sinica
    • Institute of Physics, Academia Sinica, Taipei

  • Xufeng Kou

    • Department of Electrical Engineering, University of California, Los Angeles

  • Shih-Ting Guo

    • Institute of Physics, Academia Sinica, Taipei

  • Yabin Fan

    • Department of Electrical Engineering, University of California, Los Angeles

  • Lei Pan

    • Department of Electrical Engineering, University of California, Los Angeles

  • Murong Lang

    • Department of Electrical Engineering, University of California, Los Angeles

  • Ying Jiang

    • Department of Materials Science and Engineering, Zhejiang University, Hangzhou

  • Qiming Shao

    • Department of Electrical Engineering, University of California, Los Angeles

  • Tianxiao Nie

    • Department of Electrical Engineering, University of California, Los Angeles

  • Koichi Murata

    • Department of Electrical Engineering, University of California, Los Angeles

  • Jianshi Tang

    • Department of Electrical Engineering, University of California, Los Angeles

  • Yong Wang

    • Department of Materials Science and Engineering, Zhejiang University, Hangzhou

  • Liang He

    • Department of Electrical Engineering, University of California, Los Angeles

  • Ting-Kuo Lee

    • Institute of Physics, Academia Sinica, Taipei

  • Kang L. Wang

    • Department of Electrical Engineering, University of California, Los Angeles