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HL: Fachverband Halbleiterphysik
HL 29: Quantum Transport and Quantum Hall Effects
HL 29.2: Talk
Wednesday, March 20, 2024, 10:00–10:15, EW 561
Visualizing electronic transport in the quantum anomalous Hall regime — •George Ferguson1, Run Xiao2, Anthony Richardella2, Nitin Samarth2, and Katja Nowack1 — 1Laboratory of Atomic and Solid-State Physics, Cornell University — 2Department of Physics, The Pennsylvania State University
We report a magnetic imaging study of the current distribution in the quantum anomalous Hall regime. We use a scanning superconducting quantum interference device (SQUID) microscope with micrometer scale spatial resolution to image the magnetic fields above Cr-doped (Bi,Sb)2Te3 samples. From these data we reconstruct the local current density, allowing us to visualize the current distribution in our devices. We find that most current flows in the bulk when the transport coefficients are quantized. By combining this observation with images of the equilibrium magnetization, we construct a comprehensive picture of electronic transport in the quantum anomalous Hall regime.
Keywords: Quantum Anomalous Hall; Scanning SQUID microscopy