Giant anisotropic magnetoresistance in a quantum anomalous Hall insulator

Abhinav Kandala, Anthony Richardella, Susan Kempinger, Chao-Xing Liu and Nitin Samarth ()
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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

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: 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.

Date: 2015
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8434

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DOI: 10.1038/ncomms8434

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