通过费曼路径积分的极端裁剪得到高阶边带偏振的显式公式
An explicit formula for high-order sideband polarization by extreme tailoring of Feynman path integrals
AI总结：
本文基于鞍点方法推导两带模型中高阶边带偏振矢量的显式公式，将边带振幅与激光参数、电子结构及退相速率关联，为从HSG实验提取能带信息提供简单代数途径。
摘要：
高阶边带产生（HSG）作为固体中高次谐波产生（HHG）带间过程的类似现象，是半导体中一种非微扰非线性光学现象，由相对较弱的近红外（NIR）激光和足够强的太赫兹（THz）场同时驱动。我们基于鞍点方法，在一个典型的两带模型中推导出边带偏振矢量的显式公式。该公式以高度非平凡的方式将边带振幅与激光场参数、电子结构以及非平衡退相速率联系起来。我们的结果表明，可以通过简单的代数计算从高阶边带产生实验中提取能带结构和退相速率的信息。我们还期望该方法有助于对带间HHG的定量理解。
英文摘要：
High-order sideband generation (HSG), as an analogue of the interband processes in high-harmonic generation (HHG) in solids, is a nonperturbative nonlinear optical phenomenon in semiconductors that are simultaneously driven by a relatively weak near-infrared (NIR) laser and a sufficiently strong terahertz (THz) field. We derive an explicit formula for sideband polarization vectors in a prototypical two-band model based on the saddle-point method. Our formula connects the sideband amplitudes with the laser-field parameters, electronic structures, and nonequilibrium dephasing rates in a highly nontrivial manner. Our results indicate the possibility of extracting information on band structures and dephasing rates from high-order sideband generation experiments with simple algebraic calculations. We also expect our approach to be useful on the quantitative understanding of the interband HHG.
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。
