标题： 关联晶格系统的多维相干光谱学 显示英文标题

标题： Multidimensional coherent spectroscopy of correlated lattice systems

摘要： 多维相干光谱学(MDCS)在量子化学中已被确立为研究分子系统非线性响应和非平衡动力学的强大工具。 最近，该技术也被应用于关联电子材料，其中局域态和巡游态之间的相互作用使得光谱的解释更具挑战性。 在这里，我们使用有效模型的Keldysh轮廓表示和非平衡动力学平均场理论，系统地研究典型关联格点系统的MDCS信号。 通过分析由超短激光脉冲序列引起的电流，我们展示了MDCS作为诊断关联固体中激发路径和相干过程的诊断工具的有用性。 我们还表明，该技术可以提取关于光激发非平衡态的性质和演化的详细信息。 显示英文摘要

摘要： Multidimensional coherent spectroscopy (MDCS) has been established in quantum chemistry as a powerful tool for studying the nonlinear response and nonequilibrium dynamics of molecular systems. More recently, the technique has also been applied to correlated electron materials, where the interplay of localized and itinerant states makes the interpretation of the spectra more challenging. Here we use the Keldysh contour representation of effective models and nonequilibrium dynamical mean field theory to systematically study the MDCS signals of prototypical correlated lattice systems. By analyzing the current induced by sequences of ultrashort laser pulses we demonstrate the usefulness of MDCS as a diagnostic tool for excitation pathways and coherent processes in correlated solids. We also show that this technique allows to extract detailed information on the nature and evolution of photo-excited nonequilibrium states.