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- W2763192978 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 2D 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 longitudinal resistivity under 10 m$Omega$ per square 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 pre-breakdown regime by measuring transport dependence on temperature, current, and geometry, and find evidence for bulk dissipation, including thermal activation and possible variable-range hopping." @default.
- W2763192978 created "2017-10-20" @default.
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- W2763192978 date "2018-08-27" @default.
- W2763192978 modified "2023-10-16" @default.
- W2763192978 title "Part-per-million quantization and current-induced breakdown of the quantum anomalous Hall effect" @default.
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- W2763192978 doi "https://doi.org/10.1103/physrevb.98.075145" @default.
- W2763192978 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6459416" @default.
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- W2763192978 hasPublicationYear "2018" @default.
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