journal article·2021-08-01Open access

Bulk dissipation in the quantum anomalous Hall effect

L. K. Rodenbach, I. T. Rosen, E. J. Fox, Peng Zhang, Lei Pan, Kang L. Wang, M. A. Kastner, D. Goldhaber-Gordon

APL Materials· Volume 9· Issue 8

Abstract

Even at the lowest accessible temperatures, measurements of the quantum anomalous Hall (QAH) effect have indicated the presence of parasitic dissipative conduction channels. There is no consensus whether parasitic conduction is related to processes in the bulk or along the edges. Here, we approach this problem by comparing transport measurements of Hall bar and Corbino geometry devices fabricated from Cr-doped (BiSb)2Te3. We identify bulk conduction as the dominant source of dissipation at all values of temperature and in-plane electric field. Furthermore, we observe identical breakdown phenomenology in both geometries, indicating that breakdown of the QAH phase is a bulk process. The methodology developed in this study could be used to identify dissipative conduction mechanisms in new QAH materials, ultimately guiding material development toward realization of the QAH effect at higher temperatures.
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Research context

OpenAlex topics: Topological Materials and Phenomena · Quantum and electron transport phenomena · Graphene research and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics, Stanford University 1 , Stanford, California 94305, USA

Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory 2 , 2575 Sand Hill Road, Menlo Park, California 94025, USA

Department of Applied Physics, Stanford University 3 , Stanford, California 94305, USA

Department of Electrical Engineering, University of California, Los Angeles 4 , Los Angeles, California 90095, USA

Department of Physics, Massachusetts Institute of Technology 5 , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA

Funding

U.S. Department of Energy · Army Research Office · National Science Foundation · Gordon and Betty Moore Foundation

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