论文标题
扩展的Falicov-kimball模型中激光凝结的有限温度特性：群集平均田间理论方法
Finite-temperature properties of excitonic condensation in the extended Falicov-Kimball model: Cluster mean-field-theory approach
论文作者
论文摘要
我们基于群集平均场理论方法在有限温度下研究了扩展的Falicov-Kimball模型中的电子孔对（或激子）缩合，在此我们使用正弦式群集使用正弦式群体对小簇进行了大型典型精确 - 划分分析。因此，我们计算了模型的地面和有限温度相图及其光学电导率和单粒子光谱，从而阐明了预制的配对状态如何出现在激子绝缘子的强耦合方案中。我们将结果与ta $ _2 $ nise $ _5 $的实验进行比较。
We study the electron-hole pair (or excitonic) condensation in the extended Falicov-Kimball model at finite temperatures based on the cluster mean-field-theory approach, where we make the grand canonical exact-diagonalization analysis of small clusters using the sine-square deformation function. We thus calculate the ground-state and finite-temperature phase diagrams of the model, as well as its optical conductivity and single-particle spectra, thereby clarifying how the preformed pair states appear in the strong-coupling regime of excitonic insulators. We compare our results with experiment on Ta$_2$NiSe$_5$.
