Non-reciprocal circuits based on topological magnet

The chiral edge states (CES) which exist at the edges of quantum Hall insulators and Chern insulators are manifestations of extreme non-reciprocity – they move strictly in one direction, with backscattering impossible. The direction of propagation is dictated by a topological invariant of the system. One attractive system for CES engineering is the intrinsic topological magnet MnBi₂Te₄. In this talk, I will present our progress on using CES in MnBi₂Te₄ to redirect signals and construct non-reciprocal circuits. The atomically thin nature of this material and abundance of non-trivial topological states allows control of such circuits with gate voltage and magnetic field. Our results constitute the proof-of-concept non-reciprocal circuitry based on gate-tunable atomically thin Chern insulators.