论文标题
不均匀系统中的超快自旋动力学：应用于CO/CU界面的密度 - 矩阵方法
Ultrafast spin dynamics in inhomogeneous systems: a density-matrix approach applied to Co/Cu interfaces
论文作者
论文摘要
在Co/Cu Bilayer的密度操作方法中模拟了femto-timeScales上的超快自旋动力学。电子结构以紧密结合形式表示；在密度运算符的演变过程中，考虑到飞秒激光脉冲的光激发，耦合到骨浴以及脱轴的耦合。我们的模拟证实了界面对于超快运输现象和驱电过程的重要性。此外，我们从界面上的cu $ d $轨道建立了一个回流，为$ d $轨道，在平均职业数字中显着显示。最重要的是，这种补充表现为少数派旋转电流，该电流进入CU区域几层。本研究表明，该方法捕获了必不可少的超快现象，并提供了对微观过程的见解。
Ultrafast spin dynamics on femto- to picosecond timescales is simulated within a density-operator approach for a Co/Cu bilayer. The electronic structure is represented in a tight-binding form; during the evolution of the density operator, optical excitation by a femtosecond laser pulse, coupling to a bosonic bath as well as dephasing are taken into account. Our simulations corroborate the importance of interfaces for ultrafast transport phenomena and demagnetisation processes. Moreover, we establish a reflow from Cu $d$ orbitals across the interface into Co $d$ orbitals, which shows up prominently in the mean occupation numbers. On top of this, this refilling manifests itself as a minority-spin current proceeding several layers into the Cu region. The present study suggests that the approach captures essential ultrafast phenomena and provides insight into microscopic processes.
