Jun-Cen Li | Searcharxiv

arXiv2025

Quantum control and the topological properties of the magnon photo-transport in two-dimensional collinear ferromagnet

In this work, we investigate light-induced magnon spin photocurrent (MSPC) and magnon energy photocurrent (MEPC) via the Aharonov-Casher (AC) effect. We treat the influence of the electric field through the AC effect as a perturbative term. Subsequently, we derived explicit expressions for MSPC and MEPC in a two-dimensional, collinear ferromagnetic system. Our theoretical framework is applied to both Hexagonal and Kagome two-dimensional ferromagnetic lattices. We demonstrate that MSPC and MEPC can be modulated by tuning the optical frequency and the material's relaxation time. Furthermore, in the low-frequency and infinite-relaxation-time limit, longitudinal MS(E)PC correlates with the topological properties of the magnon system.

cond-mat.mes-hall↗

arXiv2024

Intrinsic Second-Order magnon Thermal Hall Effect

In this paper, we study the intrinsic contribution of nonlinear magnon thermal Hall Effect. We derive the intrinsic second order thermal Hall conductivity of magnon by the thermal scalar potential (TSP) method and the thermal vector potential (TVP) method. We find that the intrinsic second order magnon thermal Hall conductivity is related to the thermal Berry-connection polarizability (TBCP). We apply our theory to the monolayer ferromagnetic Hexagonal lattice, and we find that the second order magnon thermal Hall conductivity can be controlled by changing Dzyaloshinskii-Moriya strength and applying strain.

cond-mat.mes-hall↗