Mn $_2$ Au中的光电流、逆法拉第效应和光自旋霍尔效应
Photocurrents, inverse Faraday effect and photospin Hall effect in Mn$_2$Au
摘要：
在反铁磁材料中，Mn $_2$ Au是研究最深入的材料之一，它是测试与反铁磁输运和动力学相关的各种想法的非常流行的平台。最近，这种材料在光学性质和光学驱动反铁磁开关方面也引起了相当大的兴趣。本工作利用第一性原理方法研究了反铁磁Mn $_2$ Au中的电荷光电流、自旋光电流和逆法拉第效应的物理机制。我们预测这些效果的对称性和幅度，并推测它们可以用于跟踪切换过程中的交错时刻的动态。我们的计算揭示了出现大的光电流的自旋共线锰$_2$金，其属性可以理解为一个非线性光学版本的自旋霍尔效应$-$，我们称之为$\textit{photospin Hall effect}$编码到驱动电荷和产生的自旋光电流之间的关系的结果。此外，我们认为，即使是很小的倾斜在锰$_2$金可以引起巨大的自旋光电流，这是$\textit{chiral}$的味道。我们的结论是，交错磁化与这种材料的结构和电子特性的组合结果在一个独特的混合突出的光电流，这使得锰$_2$金先进的光自旋电子学应用的独特平台。
英文摘要：
Among antiferromagnetic materials, Mn$_2$Au is one of the most intensively studied, and it serves as a very popular platform for testing various ideas related to antiferromagnetic magnetotransport and dynamics. Since recently, this material has also attracted considerable interest in the context of optical properties and optically-driven antiferromagnetic switching. In this work, we use first principles methods to explore the physics of charge photocurrents, spin photocurrents and inverse Faraday effect in antiferromagnetic Mn$_2$Au. We predict the symmetry and magnitude of these effects, and speculate that they can be used for tracking the dynamics of staggered moments during switching. Our calculations reveal the emergence of large photocurrents of spin in collinear Mn$_2$Au, whose properties can be understood as a result of a non-linear optical version of spin Hall effect $-$ which we refer to as the $\textit{photospin Hall effect}$ encoded into the relation between the driving charge and resulting spin photocurrents. Moreover, we suggest that even a very small canting in Mn$_2$Au can give rise to colossal spin photocurrents which are $\textit{chiral}$ in flavor. We conclude that the combination of staggered magnetization with the structural and electronic properties of this material results in a unique blend of prominent photocurrents, which makes Mn$_2$Au a unique platform for advanced optospintronics applications.
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