论文标题
二维材料的二维光谱
Two-Dimensional Spectroscopy of Two-Dimensional Materials
论文作者
论文摘要
在这项工作中，我们提供了一种精确有效的数值方法，可以模拟Mahan-Nozières-demomicis模型中的多时间相关函数，该模型粗略地模仿了掺杂的二维半导体（如单层过渡金属二核基）的光谱特性。我们应用这种方法来研究模型的相干二维电子光谱。我们表明，几种实验观察到的现象，例如在二维重塑频谱的Trion-Exciton交叉峰的等待时间依赖性中的峰值不对称和相干振荡，在我们的方法中自然而然地出现。还存在其他特征，这些特征与实验期望的行为没有对应。我们将这些特征追溯到模型的无限孔质量特性。我们使用这种理解来构建一种有效的方法，该方法过滤了与缺乏激子后座相关的配置，从而使与以前的工作的连接相关联，并为在二维半导体中的广泛掺杂范围内提供了构建现实的二维光谱的途径。
In this work we provide an exact and efficient numerical approach to simulate multi-time correlation functions in the Mahan-Nozières-De Dominicis model, which crudely mimics the spectral properties of doped two-dimensional semiconductors such as monolayer transition metal dichalcogenides. We apply this approach to study the coherent two-dimensional electronic spectra of the model. We show that several experimentally observed phenomena, such as peak asymmetry and coherent oscillations in the waiting-time dependence of the trion-exciton cross peaks of the two-dimensional rephasing spectrum, emerge naturally in our approach. Additional features are also present which find no correspondence with experimentally expected behavior. We trace these features to the infinite hole mass property of the model. We use this understanding to construct an efficient approach which filters out configurations associated with the lack of exciton recoil, enabling the connection to previous work and providing a route to the construction of realistic two-dimensional spectra over a broad doping range in two-dimensional semiconductors.
