Abstract
Magnetic topological insulator, where spontaneous magnetization is introduced by magnetic doping, realizes quantum anomalous Hall effect (QAHE). The chiral edge state (CES) at the edge of QAHE is a promising candidate for a dissipationless electronic channel under zero magnetic field. The realization temperature of QAHE was, however, extremely low below one hundred mK. To overcome this limitation, we fabricated a magnetic modulation-doped topological insulator and realized QHE and QAHE above 2 K. We utilized the high-temperature QAHE to prove and manipulate CES at the magnetic domain wall employing magnetic force microscope.
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