SFB 1238 | April 24, 14:30
Visualizing electronic transport in the quantum anomalous Hall regime
Electronic transport measurements guide the discovery and characterization of quantum materials. The Biot-Savart law dictates that the motion of electrons generates a stray magnetic field during such a transport experiment. I will show how imaging these magnetic fields with a scanning SQUID microscope allows us the determine the path that current takes through our devices. I will then discuss the application of this approach to the quantum anomalous Hall regime in magnetically doped topological insulators. Using local information about the current distribution, I will show how bulk conduction processes give rise to a quantized Hall effect. I will then describe our efforts to visualize the breakdown of the quantum anomalous Hall effect under the application of large bias currents.
MPI Dresden
Seminar Room of the Institute of Physics II
Contact: Torsten Roeper/ Erwann Bocquillon