Bulk dissipation in the quantum anomalous Hall effect

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)${}_2$Te${}_3$. 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 towards realization of the QAH effect at higher temperatures.

arXiv comment9 pages, 4 figures, with 11 pages of supplementary information

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Cited by in corpus (14)

• Current-induced breakdown of the quantum anomalous Hall effect
• Induced superconducting correlations in the quantum anomalous Hall insulator
• Conductivity of two-dimensional narrow gap semiconductors subjected to strong Coulomb disorder
• Influences of the dissipative topological edge state on quantized transport in MnBi2Te4
• Balanced Quantum Hall Resistor
• Conductivity of two-dimensional small gap semiconductors and topological insulators in strong Coulomb disorder
• A unified realization of electrical quantities from the quantum International System of Units
• Characterization of two fast-turnaround dry dilution refrigerators for scanning probe microscopy
• Chiral edge state coupling theory of transport in quantum anomalous Hall insulators
• Effects of GaAs buffer layer on quantum anomalous Hall insulator Vy(BixSb1-x)2-yTe3
• Direct visualization of edge state in even-layer MnBi2Te4 at zero magnetic field
• Measured potential profile in a quantum anomalous Hall system suggests bulk-dominated current flow
• Majorana Braiding Racetracks from Charge Chern Insulator - Superconductor Hybrids
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