阻挫反铁磁体中的从头算动力学交换相互作用
Ab initio dynamical exchange interactions in frustrated anti-ferromagnets
摘要：
利用含时自旋密度泛函理论研究了过渡金属反铁磁体中自旋-自旋交换相互作用对光脉冲激发的超快响应.我们提出了一个配方的纯动力学交换相互作用，这是非本地的空间，它是从{ \it从头开始}参数。然后，我们研究了激光脉冲对动力学过程的影响。我们发现，我们可以区分两种类型的激发，都立即激活后的激光脉冲的行动。虽然第一个可以与类斯通激发相关联，并涉及自旋从一个位置转移到另一个位置，但第二个与海森堡交换相互作用的超快修改有关，并可以在时间演化的前几百飞秒内触发自旋波的形成。
英文摘要：
The ultrafast response to an optical pulse excitation of the spin-spin exchange interaction in transition metal anti-ferromagnets is studied within the framework of the time-dependent spin-density functional theory. We propose a formulation for the purely dynamical exchange interaction, which is non-local in space, and it is derived starting from {\it ab initio} arguments. Then, we investigate the effect of the laser pulse on the onset of the dynamical process. It is found that we can distinguish two types of excitations, both activated immediately after the action of the laser pulse. While the first one can be associated to a Stoner-like excitation and involves the transfer of spin from one site to another, the second one is related to the ultrafast modification of a Heisenberg-like exchange interaction and can trigger the formation of spin waves in the first few hundred femtoseconds of the time evolution.
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