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Giant anisotropic magnetoresistance in a quantum anomalous Hall insulator

Author

Listed:
  • Abhinav Kandala

    (The Pennsylvania State University)

  • Anthony Richardella

    (The Pennsylvania State University)

  • Susan Kempinger

    (The Pennsylvania State University)

  • Chao-Xing Liu

    (The Pennsylvania State University)

  • Nitin Samarth

    (The Pennsylvania State University)

Abstract

When a three-dimensional ferromagnetic topological insulator thin film is magnetized out-of-plane, conduction ideally occurs through dissipationless, one-dimensional (1D) chiral states that are characterized by a quantized, zero-field Hall conductance. The recent realization of this phenomenon, the quantum anomalous Hall effect, provides a conceptually new platform for studies of 1D transport, distinct from the traditionally studied quantum Hall effects that arise from Landau level formation. An important question arises in this context: how do these 1D edge states evolve as the magnetization is changed from out-of-plane to in-plane? We examine this question by studying the field-tilt-driven crossover from predominantly edge-state transport to diffusive transport in Crx(Bi,Sb)2−xTe3 thin films. This crossover manifests itself in a giant, electrically tunable anisotropic magnetoresistance that we explain by employing a Landauer–Büttiker formalism. Our methodology provides a powerful means of quantifying dissipative effects in temperature and chemical potential regimes far from perfect quantization.

Suggested Citation

  • Abhinav Kandala & Anthony Richardella & Susan Kempinger & Chao-Xing Liu & Nitin Samarth, 2015. "Giant anisotropic magnetoresistance in a quantum anomalous Hall insulator," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
  • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8434
    DOI: 10.1038/ncomms8434
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    Cited by:

    1. Peng Deng & Peng Zhang & Christopher Eckberg & Su Kong Chong & Gen Yin & Eve Emmanouilidou & Xiaoyu Che & Ni Ni & Kang L. Wang, 2023. "Quantized resistance revealed at the criticality of the quantum anomalous Hall phase transitions," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    2. Wei Ai & Fuyang Chen & Zhaochao Liu & Xixi Yuan & Lei Zhang & Yuyu He & Xinyue Dong & Huixia Fu & Feng Luo & Mingxun Deng & Ruiqiang Wang & Jinxiong Wu, 2024. "Observation of giant room-temperature anisotropic magnetoresistance in the topological insulator β-Ag2Te," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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