Quantum theory of the intrinsic orbital magnetoelectric effect in itinerant electron systems at finite temperatures
Quantum theory of the intrinsic orbital magnetoelectric effect in itinerant electron systems at finite temperatures
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DOI：
10.1103/physrevb.107.094106
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发表时间：
2023-02
影响因子：
3.7
通讯作者：
Koki Shinada;Akira Kofuji;R. Peters
中科院分区：
文献类型：
--
作者：
Koki Shinada;Akira Kofuji;R. Peters
在没有反转对称性$\mathcal{P}$和时间反演对称性$\mathcal{T}$的系统中，电场可以诱导磁化。这种现象被称为磁电（ME）效应。自旋ME效应在多铁性中得到了积极的研究。零温拓扑绝缘体中也存在轨道ME效应，并主要讨论了这一效应。本文利用Kubo公式研究了有限温度下金属的内禀轨道ME响应。本征响应来源于费米海，不依赖于耗散。特别是在具有$\mathcal{PT}$-对称性的系统中，外生轨道ME效应变为零，而内生ME效应占主导地位。我们应用在这项工作中得到的响应张量的$\mathcal{PT}$-对称模型哈密顿与反铁磁回路电流的顺序表明，内在的ME效应增强周围的狄拉克点。
Magnetization can be induced by an electric field in systems without inversion symmetry $\mathcal{P}$ and time-reversal symmetry $\mathcal{T}$. This phenomenon is called the magnetoelectric (ME) effect. The spin ME effect has been actively studied in multiferroics. The orbital ME effect also exists and has been mainly discussed in topological insulators at zero temperature. In this paper, we study the intrinsic orbital ME response in metals at finite temperature using the Kubo formula. The intrinsic response originates from the Fermi sea and does not depend on the dissipation. Especially in systems with $\mathcal{PT}$-symmetry, the extrinsic orbital ME effect becomes zero, and the intrinsic ME effect is dominant. We apply the response tensor obtained in this work to a $\mathcal{PT}$-symmetric model Hamiltonian with antiferromagnetic loop current order demonstrating that the intrinsic ME effect is enhanced around the Dirac points.