固体非线性光学响应中的微观电子动力学
Microscopic electron dynamics in nonlinear optical response of solids
摘要：
我们研究了Floquet理论中晶体固体的非线性光学响应的微观性质，并证明了光致微观电荷分布显示出复杂的空间结构和非平凡的性质。它们的空间对称性和时间行为由晶体对称性决定。我们发现，即使当一个晶体的宏观光学响应是禁止的，微观光学响应可以，事实上，是非零的。在这种情况下，光诱导的电荷重新分布可以是相当大的，即使相应的傅立叶分量的每单位单元的时间依赖的偶极矩消失。我们开发了一种方法，使之有可能完全重建的微观光致电荷分布的亚周期分辨的X射线光波混频。我们还展示了如何，在这个框架内，瞬时微观光致电子电流的方向可以被揭示。
英文摘要：
We investigate the microscopic properties of the nonlinear optical response of crystalline solids within Floquet theory, and demonstrate that optically-induced microscopic charge distributions display complex spatial structure and nontrivial properties. Their spatial symmetry and temporal behavior are governed by crystal symmetries. We find that even when a macroscopic optical response of a crystal is forbidden, the microscopic optical response can, in fact, be nonzero. In such a case, the optically-induced charge redistribution can be considerable, even though the corresponding Fourier component of the time-dependent dipole moment per unit cell vanishes. We develop a method that makes it possible to completely reconstruct the microscopic optically-induced charge distributions by means of subcycle-resolved x-ray-optical wave mixing. We also show how, within this framework, the direction of the instantaneous microscopic optically-induced electron current flow can be revealed.
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