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Scanning SQUID Microscopy of the Quantum Anomalous Hall Effect

ORAL

Abstract

We report magnetic imaging of Cr-doped (Bi,Sb)2Te3 heterostructures 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 current biased devices. Using these images, we reconstruct the current density, allowing us to visualize where current flows in the devices. We also use top and back gates to study how magnetization is affected by electrostatic gating. By performing these measurements as a function of current bias, gate voltage and magnetization direction, we construct a comprehensive picture of electronic transport in our devices.

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Presenters

  • George Ferguson

    Cornell University

Authors

  • George Ferguson

    Cornell University

  • Run Xiao

    Pennsylvania State University, Physics, Pennsylvania State University

  • David Low

    Cornell University

  • Ling-Jie Zhou

    Pennsylvania State University

  • Anthony R. Richardella

    Pennsylvania State University, Physics, The Pennsylvania State University, The Pennsylvania State University, Physics, Pennsylvania State University

  • Cui-Zu Chang

    Pennsylvania State University, Department of Physics, The Pennsylvania State University, Department of Physics, Pennsylvania State University, The Pennsylvania State University

  • Nitin Samarth

    Pennsylvania State University, Department of Physics, The Pennsylvania State University, Physics, The Pennsylvania State University, Physics, Pennsylvania State University, The Pennsylvania State University

  • Katja Nowack

    Physics, Cornell University, Cornell University