Part-per-million quantization and current-induced breakdown of the quantum anomalous Hall effect

Fox, E. J.; Rosen, I. T.; Yang, Yanfei; Jones, George R.; Elmquist, Randolph E.; Kou, Xufeng; Pan, Lei; Wang, Kang L.; Goldhaber-Gordon, D.

doi:10.1103/physrevb.98.075145

Title: Part-per-million quantization and current-induced breakdown of the quantum anomalous Hall effect

Journal Article · Mon Aug 27 00:00:00 EDT 2018 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.98.075145· OSTI ID:1475435

Fox, E. J. ^[1]; Rosen, I. T. ^[2]; Yang, Yanfei ^[3]; Jones, George R. ^[3]; Elmquist, Randolph E. ^[3]; Kou, Xufeng ^[4]; Pan, Lei ^[5]; Wang, Kang L. ^[5]; Goldhaber-Gordon, D. ^[1]

Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Univ. of California, Los Angeles, CA (United States); Shanghai Tech Univ. (China)
Univ. of California, Los Angeles, CA (United States)

In the quantum anomalous Hall effect, quantized Hall resistance and vanishing longitudinal resistivity are predicted to result from the presence of dissipationless, chiral edge states and an insulating two-dimensional bulk, without requiring an external magnetic field. Here, we explore the potential of this effect in magnetic topological insulator thin films for metrological applications. Using a cryogenic current comparator system, we measure quantization of the Hall resistance to within one part per million and, at lower current bias, longitudinal resistivity under 10 mΩ at zero magnetic field. Increasing the current density past a critical value leads to a breakdown of the quantized, low-dissipation state, which we attribute to electron heating in bulk current flow. Here, we further investigate the prebreakdown regime by measuring transport dependence on temperature, current, and geometry, and find evidence for bulk dissipation, including thermal activation and possible variable-range hopping.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515; GBMF3429; W911NF-16-1-0472; W911NF-15-1-0561:P00001; ECCS-1542152

OSTI ID:: 1475435

Alternate ID(s):: OSTI ID: 1466853

Journal Information:: Physical Review. B, Vol. 98, Issue 7; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 48 works

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