论文标题
在半填充的哈伯德模型和伪PSEUDOGAP中，单粒子光谱功能的热演化
Thermal evolution of single-particle spectral function in the half-filled Hubbard model and pseudogap
论文作者
论文摘要
在正方形晶格上的半填充一轨式哈伯德模型中，我们发现了与动量分辨光谱函数相关的两峰结构的形式的pseduogap特征，该光谱函数存在于温度窗口$ t_n \ lyssim t \ lyssim t \ lyssim t \ sillsim t^*$中。 $ t^*$是在状态密度下的温度以下的温度。在窗口内部$ t_n \ Lessim t \ Lessim t^*$，在动量分辨光谱函数的两峰结构中的峰值间隔在沿正常状态FERMI表面向$（π/2，0）$（π，0）$偏离点（$π/2，π/2 $）时，与阶段相似的行为相似。我们通过使用基于集群的蒙特卡洛方法来揭示这些功能，以模拟超级晶格上的磁性参数字段，这使我们能够访问势头分辨的单粒子光谱函数，对应于与$ \ sim $ 240 $ \ sim $ 240 $ \ times $ 240 $ 240相对应的，几乎可以忽略的有限量效果。
In the half-filled one-orbital Hubbard model on a square lattice, we find pseduogap features in the form of two-peak structures associated with the momentum-resolved spectral function, which exists within the temperature window $T_N \lesssim T \lesssim T^*$. $T^*$ is the temperature below which there exists a well-formed dip in the density of state. Inside the window $T_N \lesssim T \lesssim T^*$, the peak-to-peak separation in the two-peak structure of the momentum-resolved spectral function rises on moving away from the point ($π/2, π/2$) along the normal state Fermi surface towards $(π, 0)$, a behavior remarkably similar to what is observed in the pseudogap phase. We unveil these features by using a parallelized cluster-based Monte-Carlo method for simulating the magnetic order parameter fields on a superlattice, which enables us to access the momentum-resolved single-particle spectral function corresponding to a lattice size of $\sim$ 240 $\times$ 240 with almost negligible finite-size effects.
