Demonstration of Dissipative Quasihelical Edge Transport in Quantum Anomalous Hall Insulators

Abstract

Doping a topological insulator (TI) film with transition metal ions can break its time-reversal symmetry and lead to the realization of the quantum anomalous Hall (QAH) effect. Prior studies have shown that the longitudinal resistance of the QAH samples usually does not vanish when the Hall resistance shows a good quantization. This has been interpreted as a result of the presence of possible dissipative conducting channels in magnetic TI samples. By studying the temperature- and magnetic field-dependence of the magnetoresistance of a magnetic TI sandwich heterostructure device, we demonstrate that the predominant dissipation mechanism in thick QAH insulators can switch between non-chiral edge states and residual bulk states in different magnetic field regimes. The interactions between bulk states, chiral edge states, and non-chiral edge states are also investigated. Our study provides a way to distinguish between the dissipation arising from the residual bulk states and non-chiral edge states, which is crucial for achieving true dissipationless transport in QAH insulators and for providing deeper insights into QAH-related phenomena.

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Cited by in corpus (9)

• Colloquium: Quantum anomalous Hall effect
• Confinement-Induced Chiral Edge Channel Interaction in Quantum Anomalous Hall Insulators
• Progress and prospects in the quantum anomalous Hall effect
• Creation of Chiral Interface Channels for Quantized Transport in Magnetic Topological Insulator Multilayer Heterostructures
• Thermal dissipation in the quantum Hall regime in graphene
• Influences of the dissipative topological edge state on quantized transport in MnBi2Te4
• Three-Dimensional Quantum Anomalous Hall Effect in Magnetic Topological Insulator Trilayers of Hundred-Nanometer Thickness
• Chiral edge state coupling theory of transport in quantum anomalous Hall insulators
• Magnetization-free quantum anomalous Hall effect in altermagnetic weak topological insulators