Anomalous Transport in Magnetic Weyl Semimetal
The quantum anomalous Hall effect (QAHE) and magnetic Weyl semimetals (WSMs) are topological states induced by intrinsic magnetic moments and spin-orbit coupling. Large Berry curvature from the topological band structure leads to giant anomalous electrical and thermoelectrical responses. The interplay between magnetism and topology in the platform of kagome-lattice leads to the first experimental discovery of magnetic WSM Co3Sn2S2. Via theoretical calculations and transport measurements, giant anomalous Hall effect and anomalous Nernst effect were observed in it. The new record of anomalous Hall angle in Co3Sn2S2 inspired the theory study of achieving the QAHE by dimensional confinement of the magnetic WSM, and a QAHE with a Chern number of 3 was predicted. These works present a realistic avenue to realize QAH states in thin films of magnetic WSMs.