论文标题
从带隙材料的高阶谐波生成多个高平台的晶体摩托明分辨的贡献
Crystal-momentum-resolved contributions to multiple plateaus of high-order harmonic generation from band-gap materials
论文作者
论文摘要
我们研究了带隙材料中对高阶谐波产生（HHG）的晶体摩菌分辨的贡献，并确定HHG光谱第一和更高高原的相关初始晶体矩A。我们通过使用一维线性链的时间相关密度功能理论模型来做到这一点。我们引入了对线性链模型无限扩展极限的自洽周期性处理，该处理提供了一种方便的方法，可以从超出单活动电子近似之外的完美晶体中模拟和讨论HHG。通过考虑了多个传导带，通过半经典的K空间轨迹分析来阐明多斑光谱特征。在考虑的激光互动状态下，发现第一个截止超出第一个截止的多个高原主要来自具有初始晶体动量的电子（k = 0），而具有初始晶体动量的电子位于伽马点围绕伽马点，负责第一个高原中的谐波。我们还表明，可以使用足够大的有限模型从计算中获得类似的发现，这证明可以模仿带状结构和HHG光谱的相应无限周期性限制。
We study the crystal-momentum-resolved contributions to the high-order harmonic generation (HHG) in band-gap materials, and identify the relevant initial crystal momenta for the first and higher plateaus of the HHG spectra. We do so by using a time-dependent density-functional theory model of one-dimensional linear chains. We introduce a self-consistent periodic treatment for the infinitely extended limit of the linear chain model, which provides a convenient way to simulate and discuss the HHG from a perfect crystal beyond the single-active-electron approximation. The multi-plateau spectral feature is elucidated by a semiclassical k-space trajectory analysis with multiple conduction bands taken into account. In the considered laser-interaction regime, the multiple plateaus beyond the first cutoff are found to stem mainly from electrons with initial crystal momenta away from the Gamma point (k = 0), while electrons with initial crystal momenta located around the Gamma point are responsible for the harmonics in the first plateau. We also show that similar findings can be obtained from calculations using a sufficiently large finite model, which proves to mimic the corresponding infinite periodic limit in terms of the band structures and the HHG spectra.
