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非线性相干光谱是一种测量材料非线性光学响应的谱学手段. 相比线性光谱, 非线性相干光谱具有多个时间变量, 能够提供材料的更多信息. 作为非线性相干光谱的代表之一, 二维相干光谱在众多领域取得了丰硕的成果. 在化学、生物学等领域, 二维相干光谱已经展现出相比线性谱学的优越性. 随着太赫兹技术的发展, 二维相干光谱在强关联体系也显现出巨大潜力, 相关的理论与实验工作正在开展. 本文简要概括了强关联体系二维相干光谱的发展现状, 介绍了二维相干光谱的基本概念与理论工具, 分析了二维相干光谱的主要特点, 并重点总结了我们研究组近几年关于强关联体系二维相干光谱的理论研究工作.Two-dimensional coherent spectroscopy (2DCS) diagnoses a material’s nonlinear optical response with multiple time variables, thus offering information that is inaccessible with conventional linear optical spectroscopy. The 2DCS in the infrared, visible, and ultraviolet frequency range has yielded fruitful results in chemistry and biology. In the terahertz (THz) frequency window, 2DCS has shown its promise in the study of strongly-correlated electronic systems. As a guide to this rapidly developing field, we survey the current status of the theory of THz-2DCS in strongly-correlated electronic systems. We then introduce the basic concepts and theoretical methods of 2DCS, and analyze the main characteristics of the two-dimensional spectra. Finally, we summarize our latest theoretical research in this field.
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