Magnonic quantum Hall effect and Wiedemann-Franz law

Article

关键词: ANISOTROPIC SUPEREXCHANGE INTERACTION;    BOSE-EINSTEIN CONDENSATION;    TOPOLOGICAL INVARIANT;    WEAK FERROMAGNETISM;    ROOM-TEMPERATURE;    SPIN CURRENTS;    BERRY PHASE;    CONDUCTANCE;    SYSTEMS;    SPINTRONICS;   

DOI  :  10.1103/PhysRevB.95.125429

来源: SCIE

【 摘 要 】

We present a quantum Hall effect of magnons in two-dimensional clean insulating magnets at finite temperature. Through the Aharonov-Casher effect, a magnon moving in an electric field acquires a geometric phase and forms Landau levels in an electric field gradient of sawtooth form. At low temperatures, the lowest energy band being almost flat carries a Chern number associated with a Berry curvature. Appropriately defining the thermal conductance for bosons, we find that the magnon Hall conductances get quantized and show a universal thermomagnetic behavior, i.e., are independent of materials, and obey a Wiedemann-Franz law for magnon transport. We consider magnons with quadratic and linear (Dirac-like) dispersions. Finally, we show that our predictions are within experimental reach for ferromagnets and skyrmion lattices with current device and measurement techniques.

【 授权许可】

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