阿秒非线性X射线谱的多体格林函数方法
Many-body Green's function approach to attosecond nonlinear X-ray spectroscopy
摘要：
利用准粒子非线性激子光学响应表象，导出了共振多维X射线光谱的闭合表达式。这种形式主义适用于预测相干四波混频信号探测单和两个核心空穴状态。本文将非线性X射线信号用单粒子和双粒子格林函数表示，格林函数可在$GW$水平上求解类Hedin方程。
英文摘要：
Closed expressions are derived for resonant multidimensional X-ray spectroscopy using the quasiparticle nonlinear exciton representation of optical response. This formalism is applied to predict coherent four wave mixing signals which probe single and two core-hole states. Nonlinear X-ray signals are compactly expressed in terms of one- and two- particle Green's functions which can be obtained from the solution of Hedin-like equations at the $GW$ level.
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