二维纯绝缘反铁磁体的轨道压磁极化率
Orbital piezomagnetic polarizability of pure insulating altermagnets in two dimensions
AI总结：
本文研究了二维纯绝缘反铁磁体在应变下的轨道压磁效应，揭示了极化率与伯尔 curvature的关系，并讨论了其与当前材料的联系。
摘要：
纯反铁磁体独特的对称性质使其成为压磁现象的天然候选者。此前受反铁磁体压磁性质启发的研究主要集中在施加应变下自旋磁化响应的研究上。本文研究了二维纯绝缘反铁磁体的轨道压磁效应——即轨道磁化对施加应变的响应——在最小晶格模型中。我们获得了应变存在下轨道磁化的通用微观表达式，以及轨道压磁极化率，即纯反铁磁体的定义响应特征。我们将这些表达式应用于三个特定的四方晶格模型，其中两个对应于d波反铁磁体，一个描述g波反铁磁体。尽管d波反铁磁体与线性压磁极化率相关，而g波反铁磁体则表现出非线性压磁效应。我们的分析揭示了极化率如何与和由占据能带的伯尔 curvature相关联和确定。讨论了与当前感兴趣的材料的联系。
英文摘要：
The distinctive symmetry properties of pure altermagnets make them natural candidates for piezomagnetism. Previous work motivated by the piezomagnetic properties of altermagnets has primarily focused on the spin magnetization response to applied strain. In this paper we study orbital piezomagnetic effects--the orbital magnetization response to applied strain--in minimal lattice models of pure insulating altermagnets in two dimensions. We obtain general microscopic expressions for the orbital magnetization in the presence of strain, as well as the orbital piezomagnetic polarizability, i.e., the defining response characteristic of pure altermagnets. We apply these expressions to three specific tetragonal lattice models, two corresponding to $d$-wave altermagnets and one describing a $g$-wave altermagnet. Whereas the $d$-wave altermagnets are associated with a linear piezomagnetic polarizability, the $g$-wave altermagnet exhibits a nonlinear piezomagnetic effect. Our analysis reveals how the polarizabilities are related to and determined by the Berry curvature of the occupied bands. Connections to materials of current interest are discussed.
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