Analysis of model-parameter dependences on the second-order nonlinear conductivity in PT-symmetric collinear antiferromagnetic metals with magnetic toroidal moment
Analysis of model-parameter dependences on the second-order nonlinear conductivity in PT-symmetric collinear antiferromagnetic metals with magnetic toroidal moment
复制标题
具有磁环矩的 PT 对称共线反铁磁金属中二阶非线性电导率的模型参数依赖性分析
DOI：
10.1103/physrevb.105.155157
复制
发表时间：
2022
影响因子：
3.7
通讯作者：
Hayami Satoru
中科院分区：
文献类型：
--
作者：
Yatsushiro Megumi;Oiwa Rikuto;Kusunose Hiroaki;Hayami Satoru
磁环向矩是在没有空间反演和时间反演对称性的情况下的基本电子自由度，并产生了新的多铁性和输运性质。研究了具有磁环力矩的时空对称共线反铁磁金属非线性输运的基本模型参数。基于非线性Kubo公式分析了二维堆叠之链上二阶非线性电导率的纵向和横向分量，表明磁环力矩和反对称自旋轨道相互作用之间的有效耦合是非线性电导率的重要来源。此外，我们发现多带系统中的非互易纵向电流和非线性横向电流在低于反铁磁有序的转变温度时显著增强。我们还讨论了非线性电导率与线性磁电系数和电导率的关系。本文的研究结果对探索环形铁金属中非线性导电现象的微观本质和阐明其参数依赖性具有指导意义。
A magnetic toroidal moment is a fundamental electronic degree of freedom in the absence of both spatial inversion and time-reversal symmetries and gives rise to novel multiferroic and transport properties. We elucidate essential model parameters of the nonlinear transport in the space-timesymmetric collinear antiferromagnetic metals accompanying a magnetic toroidal moment. By analyzing the longitudinal and transverse components of the second-order nonlinear conductivity on a two-dimensionally stacked zigzag chain based on the nonlinear Kubo formula, we show that an effective coupling between the magnetic toroidal moment and the antisymmetric spin-orbit interaction is an essential source of the nonlinear conductivity. Moreover, we find that the nonreciprocal longitudinal current and nonlinear transverse current in a multiband system are largely enhanced just below the transition temperature of the antiferromagnetic ordering. We also discuss the relevance of the nonlinear conductivity to the linear magnetoelectric coefficient and conductivity. Our result serves as a guide for exploring the microscopic essence and clarifying the parameter dependence of the nonlinear conductive phenomena in ferrotoroidal metals.