论文标题
一维莫特绝缘子中的激子光谱和能量结构，通过将多体渗透函数应用于电荷模型来证明
Excitonic optical spectra and energy structures in a one-dimensional Mott insulator demonstrated by applying a many-body Wannier functions method to a charge model
论文作者
论文摘要
我们已经在理论上应用了多体缺乏函数方法来计算具有较大系统尺寸的绝对零温度下的一维（1D）Mott绝缘子中的激子光学电导率和能量结构。专注于与圆顶和Doublon对相关的全充电波动，我们采用了一个电荷模型，该模型被解释为一个有效的模型，以在旋转电荷分离图中半填充一维延长的哈伯德模型的光递增模型。结果，具有适当宽度的理论光谱定性地重现了ET-F $ _ {2} $ tcnq的最新实验数据，该数据在294 K时有和没有调制电场。关于激子能量结构，我们发现激子，尤其是对于偶数而言，受多体效应的约束。这也与最近实验中报告的拟合参数一致。因此，本文提出的我们的理论方法实际上对于理解一维莫特绝缘子多体激发态的电荷波动的物理作用很有用。
We have applied a many-body Wannier functions method to theoretically calculate an excitonic optical conductivity spectrum and energy structure in a one-dimensional (1D) Mott insulator at absolute zero temperature with large system size. Focusing on full charge fluctuations associated with pairs of a holon and doublon, we employ a charge model, which is interpreted as a good effective model to investigate photoexcitations of a 1D extended Hubbard model at half-filling in the spin-charge separation picture. As a result, the theoretical spectra with appropriate broadenings qualitatively reproduce the recent experimental data of ET-F$_{2}$TCNQ at 294 K with and without a modulated electric field. Regarding the excitonic energy structure, we have found that the excitons, especially for even-parity, are weakly bound by many-body effects. This is also consistent with the fitting parameters reported in the recent experiment. Thus, our theoretical method presented in this paper is practically useful to understand physical roles of charge fluctuations in many-body excited states of a 1D Mott insulator.
