Interacting topological magnons in a checkerboard ferromagnet  

作　　者：朱恒 施洪潮 唐政国 唐炳 Heng Zhu;Hongchao Shi;Zhengguo Tang;Bing Tang(Department of Physics,Jishou University,Jishou 416000,China)

机构地区：[1]Department of Physics,Jishou University,Jishou 416000,China

出　　处：《Chinese Physics B》2024年第3期596-601,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.12064011);the Natural Science Fund Project of Hunan Province(Grant No.2020JJ4498);the Graduate Research Innovation Foundation of Jishou University(Grant No.Jdy21030).

摘　　要：This work is devoted to studying the magnon-magnon interaction effect in a two-dimensional checkerboard ferromagnet with the Dzyaloshinskii-Moriya interaction.Using a first-order Green function method,we analyze the influence of magnon-magnon interaction on the magnon band topology.We find that Chern numbers of two renormalized magnon bands are different above and below the critical temperature,which means that the magnon band gap-closing phenomenon is an indicator for one topological phase transition of the checkerboard ferromagnet.Our results show that the checkerboard ferromagnet possesses two topological phases,and its topological phase can be controlled either via the temperature or the applied magnetic field due to magnon-magnon interactions.Interestingly,it is found that the topological phase transition can occur twice with the increase in the temperature,which is different from the results of the honeycomb ferromagnet.

关 键 词：topological magnons magnon-magnon interactions topological phase transitions checkerboard ferromagnets 

分 类 号：O469[理学—凝聚态物理]