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arXiv 2103.15657cond-mat.mtrl-sci
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金属反铁磁体中的Laser感应转矩

Laser-induced torques in metallic antiferromagnets

Frank Freimuth, Stefan Blügel, Yuriy Mokrousov

摘要:

研究了反铁磁体(AFM)Mn $_2$ Au中的激光感应力矩。我们发现,即使是线偏振光也可以在Mn $_2$ Au中引起激光诱导扭矩,即,光不必是圆偏振的。激光引起的扭矩在Mn $_2$ Au的大小在光学频率的铁磁体Fe,Co和FePt。我们还计算了太赫兹(THz)频率下的激光诱导扭矩,并将其与太赫兹激光脉冲激发的自旋轨道扭矩(SOTs)进行了比较。我们发现SOTs是占主导地位的太赫兹频率的实验中使用的激光场强度。此外,我们表明,自旋轨道相互作用(SOI)的矩阵元素可以被用来添加SOI只有在Wannier插值,我们称之为Wannier插值的SOI(WISOI)。这种技术使我们能够方便地执行Wannier插值的许多磁化方向从一个单一的一组Wannier函数。

英文摘要:

We study the laser-induced torques in the antiferromagnet (AFM) Mn$_2$Au. We find that even linearly polarized light may induce laser-induced torques in Mn$_2$Au, i.e., the light does not have to be circularly polarized. The laser-induced torques in Mn$_2$Au are comparable in magnitude to those in the ferromagnets Fe, Co and FePt at optical frequencies. We also compute the laser-induced torques at terahertz (THz) frequencies and compare them to the spin-orbit torques (SOTs) excited by THz laser-pulses. We find the SOTs to be dominant at THz frequencies for the laser-field strengths used in experiments. Additionally, we show that the matrix elements of the spin-orbit interaction (SOI) can be used to add SOI only during the Wannier interpolation, which we call Wannier interpolation of SOI (WISOI). This technique allows us to perform the Wannier interpolation conveniently for many magnetization directions from a single set of Wannier functions.

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