arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2012.10334physics.opticscond-mat.mes-hall
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利用亚周期分辨的X射线-光波混频对固体中laser驱动的电子动力学的原子尺度成像

Atomic-scale imaging of laser-driven electron dynamics in solids using subcycle-resolved x-ray-optical wave mixing

Daria Popova-Gorelova, Robin Santra

摘要:

我们调查激光驱动的电子动力学在固体中的原子尺度上,并在真实空间内的Floquet形式主义,并开发了一种方法的基础上亚周期分辨X射线光波混合重建这些动态。我们分析了时间反转和反转对称性如何影响光致电荷分布和微观电子流的性质。几个例子的$μ$阶带隙晶体的微观光学响应的情况下,当有一个相当大的或消失的$μ$阶宏观响应进行了比较。然后,我们分析的后果,晶体对称性上的亚周期分辨X射线光波混合,一个过程中,一个X射线脉冲的持续时间短于光周期的驱动脉冲与激光修整晶体相互作用。在此基础上,我们提出了一种利用X射线-光混频谱的动量和延迟依赖关系来重建光致电荷分布傅里叶分量的振幅和相位的方法。亚周期分辨的X射线-光波混频也揭示了微观光学响应的时间振荡的相位和微观激光驱动电子流的一些性质。

英文摘要:

We investigate laser-driven electron dynamics in solids on the atomic scale and in real space within Floquet formalism, and develop a method based on subcycle-resolved x-ray-optical wave mixing to reconstruct those dynamics. We analyze how time-reversal and inversion symmetries influence properties of optically-induced charge distributions and microscopic electron currents. Several examples for the $μ$th-order microscopic optical response of band-gap crystals are shown and compared for cases when there is either a considerable or a vanishing $μ$th-order macroscopic response. We then analyze the consequence of crystal symmetries on subcycle-resolved x-ray-optical wave mixing, a process in which an x-ray pulse of a duration shorter than the optical cycle of the driving pulse interacts with a laser-dressed crystal. Based on this analysis, we develop a method to reconstruct amplitudes and phases of Fourier components of optically-induced charge distributions from momentum and delay dependence of x-ray-optical wave-mixing spectra. Subcycle-resolved x-ray-optical wave mixing also reveals phases of temporal oscillations of microscopic optical response and some properties of microscopic laser-driven electron currents.

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