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

Abstract

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.

Authors:
 [1];  [2];  [3];  [3];  [3];  [4];  [5];  [5];  [1]
  1. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
  3. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  4. Univ. of California, Los Angeles, CA (United States); Shanghai Tech Univ. (China)
  5. Univ. of California, Los Angeles, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1475435
Alternate Identifier(s):
OSTI ID: 1466853
Grant/Contract Number:  
[AC02-76SF00515; GBMF3429; W911NF-16-1-0472; W911NF-15-1-0561:P00001; ECCS-1542152]
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
[ Journal Volume: 98; Journal Issue: 7]; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Fox, E. J., Rosen, I. T., Yang, Yanfei, Jones, George R., Elmquist, Randolph E., Kou, Xufeng, Pan, Lei, Wang, Kang L., and Goldhaber-Gordon, D. Part-per-million quantization and current-induced breakdown of the quantum anomalous Hall effect. United States: N. p., 2018. Web. doi:10.1103/physrevb.98.075145.
Fox, E. J., Rosen, I. T., Yang, Yanfei, Jones, George R., Elmquist, Randolph E., Kou, Xufeng, Pan, Lei, Wang, Kang L., & Goldhaber-Gordon, D. Part-per-million quantization and current-induced breakdown of the quantum anomalous Hall effect. United States. doi:10.1103/physrevb.98.075145.
Fox, E. J., Rosen, I. T., Yang, Yanfei, Jones, George R., Elmquist, Randolph E., Kou, Xufeng, Pan, Lei, Wang, Kang L., and Goldhaber-Gordon, D. Mon . "Part-per-million quantization and current-induced breakdown of the quantum anomalous Hall effect". United States. doi:10.1103/physrevb.98.075145. https://www.osti.gov/servlets/purl/1475435.
@article{osti_1475435,
title = {Part-per-million quantization and current-induced breakdown of the quantum anomalous Hall effect},
author = {Fox, E. J. and Rosen, I. T. and Yang, Yanfei and Jones, George R. and Elmquist, Randolph E. and Kou, Xufeng and Pan, Lei and Wang, Kang L. and Goldhaber-Gordon, D.},
abstractNote = {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.},
doi = {10.1103/physrevb.98.075145},
journal = {Physical Review B},
number = [7],
volume = [98],
place = {United States},
year = {2018},
month = {8}
}

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