On the zero-field quantization of the anomalous quantum Hall effect in moiré 2D layers

Abstract

In recent breakthrough experiments, twisted moiré layers of transition metal dichalcogenides are found to manifest both integer (IQAHE) and fractional (FQAHE) quantum anomalous Hall effects in zero applied magnetic field because of the underlying flat band topology and spontaneous breaking of the time reversal invariance. In the current work, we critically analyze the experimental values of the quantized conductance in each case to emphasize the role of disorder in the problem, pointing out that obtaining accurate quantized conductance in future experiments would necessitate better contacts and lower disorder.

Updated version (including added Fig. 8) to appear in Phys. Rev. B (Letter)

References in corpus (12)

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• Fractional quantum Hall states at zero magnetic field
• Nearly-flat bands with nontrivial topology
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• Quantum phases of disordered flatband lattice fractional quantum Hall systems
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