Berlin 2024 – scientific programme

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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