arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2210.07899physics.opticscond-mat.otherphysics.comp-ph
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通过时域场分析揭示固体中的极端非线性动力学

Uncovering Extreme Nonlinear Dynamics in Solids Through Time-Domain Field Analysis

Phillip D. Keathley, Simon V. B. Jensen, Matthew D. Yeung, Mina R. Bionta, Lars B. Madsen

摘要:

由于出现了灵敏的,片上技术的拍赫兹尺度的光场采样的谐波场的时域分析与子周期的分辨率,现在是实验上可行的。我们演示了如何这样一个时域,场分辨分析揭示了极端的非线性电子动力学负责固体内的高次谐波产生。利用含时密度泛函理论模拟了近中红外波形驱动下固态带隙系统的谐波产生。特别注意的制度,带内和带间发射机制发挥了关键作用,在塑造的非线性响应。我们表明,谐波辐射场的时域分析确定的非线性光产生的带内和带间动力学过程之间的相互作用。通过进一步的分析,我们表明,变化的主导发射制度后,可以发生轻微的变化,峰值驱动强度和中心驱动波长。谐波场的时域分析还首次揭示了在驱动脉冲包络的时间窗口内主导发射机制快速变化的可能性。最后,我们研究的实验可行性进行时域分析的谐波场与子周期分辨率使用现实的参数。

英文摘要:

Time-domain analysis of harmonic fields with sub-cycle resolution is now experimentally viable due to the emergence of sensitive, on-chip techniques for petahertz-scale optical-field sampling. We demonstrate how such a time-domain, field-resolved analysis uncovers the extreme nonlinear electron dynamics responsible for high-harmonic generation within solids. Time-dependent density functional theory was used to simulate harmonic generation from a solid-state band-gap system driven by near- to mid-infrared waveforms. Particular attention was paid to regimes where both intraband and interband emission mechanisms play a critical role in shaping the nonlinear response. We show that a time-domain analysis of the harmonic radiation fields identifies the interplay between intra- and interband dynamical processes underlying the nonlinear light generation. With further analysis, we show that changes to the dominant emission regime can occur after only slight changes to the peak driving intensity and central driving wavelength. Time-domain analysis of harmonic fields also reveals, for the first time, the possibility of rapid changes in the dominant emission mechanism within the temporal window of the driving pulse envelope. Finally, we examine the experimental viability of performing time-domain analysis of harmonic fields with sub-cycle resolution using realistic parameters.

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