Topological magnon-polaron transport in a bilayer van der Waals magnet

被引:2
作者
Lin, Zhi-Xing [1 ]
Zhang, Shu [2 ]
机构
[1] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA
[2] Max Planck Inst Phys Komplexer Syst, Dresden, Germany
关键词
TRANSITION; INSULATOR; EXCITATIONS; CRYSTAL; FIELD; MAGNETIZATION; FECL2;
D O I
10.1063/5.0191253
中图分类号
O59 [应用物理学];
学科分类号
摘要
The stacking of intrinsically magnetic van der Waals materials provides a fertile platform to explore tunable transport effects of magnons, presenting significant prospects for spintronic applications. The possibility of having topologically nontrivial magnons in these systems can further expand the scope of exploration. In this work, we consider a bilayer system with intralayer ferromagnetic exchange and a weak interlayer antiferromagnetic exchange and study the topological magnon-polaron excitations induced by magnetoelastic couplings. Under an applied magnetic field, the system features a metamagnetic transition, where the magnetic ground state changes from antiparallel layers to parallel. We show that the metamagnetic transition is accompanied by a transition of the topological structure of the magnon polarons, which results in discernible changes in the topology induced transport effects. The magnetic-field dependence of the thermal Hall conductivity and spin Nernst coefficient is analyzed with linear response theories.
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页数:6
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