Fig. 3: Evolution of the chiral edge current with gate tuning under opposite current bias direction.
From: Direct observation of chiral edge current at zero magnetic field in a magnetic topological insulator
a and b Current flux images at \({V}_{{{\rm{g}}}}=\) 0 V with bias current on the right and left electrodes, respectively. The sample is magnetized with a −9 T field. c and d Line scans of current flux as a function of \({V}_{{{\rm{g}}}}\) along the dashed line in (a) for the two bias directions. The yellow dashed lines delineate the two edges of the device. The evolution of the current flux distribution with \({V}_{{{\rm{g}}}}\) suggests that the chiral edge current appears only within the bulk magnetic exchange gap.
