TY - JOUR
T1 - Part-per-million quantization and current-induced breakdown of the quantum anomalous Hall effect
AU - Fox, E. J.
AU - Rosen, I. T.
AU - Yang, Yanfei
AU - Jones, George R.
AU - Elmquist, Randolph E.
AU - Kou, Xufeng
AU - Pan, Lei
AU - Wang, Kang L.
AU - Goldhaber-Gordon, D.
N1 - Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/8/27
Y1 - 2018/8/27
N2 - 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. 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.
AB - 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. 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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U2 - 10.1103/PhysRevB.98.075145
DO - 10.1103/PhysRevB.98.075145
M3 - Article
AN - SCOPUS:85052839861
SN - 2469-9950
VL - 98
JO - Physical Review B
JF - Physical Review B
IS - 7
M1 - 075145
ER -