arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1906.00596cond-mat.mtrl-sci
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固体中高次谐波产生的子带图像

Sub-band picture of high-harmonic generation in solids

Tomohiro Tamaya, Takeo Kato

摘要:

基于随时间变化的能带结构的概念,我们提出了固体中高次谐波产生的新图景。为了证明这张照片的效用,我们专注于高阶边带产生(HSG)所造成的强太赫兹(THz)和弱近红外(NIR)光的背景下,泵浦探测光谱。我们发现HSG的近红外频率依赖性表明在带隙能量附近存在新的能级(子带),它们具有多个太赫兹光频率。这个子带图像解释了为什么HSG强度成为THz光振幅的非单调函数。本文的分析不仅揭示了高次谐波谱中平台结构的起源,而且提供了与其它高场现象的联系。

英文摘要:

We propose a novel picture of high-harmonic generation (HHG) in solids based on the concept of temporally changing band structures. To demonstrate the utility of this picture, we focus on the high-order sideband generation (HSG) caused by strong terahertz (THz) and weak near-infrared (NIR) light in the context of pump-probe spectroscopy. We find that the NIR frequency dependence of the HSG indicates the existence of new energy levels (sub-bands) around the band-gap energy, which have multiple frequencies of THz light. This sub-band picture explains why the HSG intensity becomes a non-monotonic function of the THz light amplitude. The present analysis not only reveals the origin of the plateau structure in HHG spectra, but also provides a connection to other high-field phenomena.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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