发表机构
University at Buffalo, State University of New York（纽约州立大学布法罗分校）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究理论分析了反铁磁体和交变磁体中磁振子的动量空间极化织构与输运，揭示了极化弛豫的两种机制，并预测了磁场方向对扩散长度和弛豫的调控效应。
AI 中文摘要
反铁磁体（AFM）中的磁振子可以表现出亚晶格磁化动力学的完全圆极化、椭圆极化和线极化。我们从理论上分析了共线反铁磁体和交变磁体（AM）中不同的动量空间磁振子极化织构以及磁振子输运。极化织构对磁振子动量方向的敏感性决定了磁振子极化动力学的两种机制：Dyakonov-Perel弛豫或由异步拉莫尔进动引起的退相。对于易轴反铁磁体，平行于Néel矢量的磁场会抑制磁偶极相互作用诱导的Dyakonov-Perel弛豫，同时导致磁振子自旋扩散长度增加，并出现其随温度升高而反直觉增长的现象。相反，对于垂直取向，拉莫尔进动会增强磁振子圆极化的弛豫。最后，我们预测了具有Dzyaloshinskii-Morya相互作用的交变磁体或反铁磁体中磁振子极化的极端各向异性弛豫。
英文摘要
Antiferromagnets (AFMs) host magnons that can exhibit fully circular, elliptic and linear polarizations of sublattice magnetization dynamics. We analyze theoretically different momentum-space magnon polarization textures and magnon transport in collinear AFMs and altermagnets (AMs). The sensitivity of the polarization texture to a magnon momentum direction determines two regimes of magnon polarization kinetics: The Dyakonov-Perel relaxation or its dephasing due to asynchronous Larmor precession. For an easy-axis AFM, magnetic field parallel to the N{é}el vector leads to the suppression of the magnetic dipolar interaction-induced Dyakonov-Perel relaxation, accompanied by the increase in the magnon spin-diffusion length and its counter-intuitive growth with temperature. For a perpendicular orientation, instead, relaxation of circular polarization of magnons is enhanced due to Larmor precession. Finally, extremely anisotropic relaxation of magnon polarization is predicted for AMs or AFMs having Dzyaloshinskii-Morya interaction.
Comments8 Pages, 3 Figures
