论文标题
lieb晶格中的绝缘体pseudogap跨界
Insulator-pseudogap crossover in the Lieb lattice
论文作者
论文摘要
我们研究了Lieb晶格中有吸引力的哈伯德模型，以了解平坦带系统中超导临界温度上方的正常状态。我们使用簇动态平均场理论来计算群集中包含的完全量子波动的两粒子敏感性。在相互作用的强度低于跳跃振幅下，我们发现平坦带上的正常状态是绝缘体。绝缘行为源于平坦带的定位特性。在较大的相互作用下，出现了具有耗尽光谱函数的平面增强的伪组。
We study the attractive Hubbard model in the Lieb lattice to understand the normal state above the superconducting critical temperature in a flat band system. We use cluster dynamical mean-field theory to compute the two-particle susceptibilities with full quantum fluctuations included in the cluster. At interaction strengths lower than the hopping amplitude, we find that the normal state on the flat band is an insulator. The insulating behavior stems from the localization properties of the flat band. A flat-band enhanced pseudogap with a depleted spectral function arises at larger interactions.
