中等关联层状吸引哈伯德模型中的赝能隙形成
Pseudogap formation in the moderate correlated layered attractive Hubbard model
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中文总结 AI 辅助
研究中等关联层状吸引哈伯德模型在四分之一填充时的情况，用波动局部场方法计算相关物理量，证明团簇系统中赝能隙出现，还给出大层状系统在特定团簇方案下态密度赝能隙的结果。
中文摘要 AI 辅助
我们考虑在四分之一填充时具有中等相互作用强度的层状吸引哈伯德模型。使用波动局部场方法在有效相互作用消失的近似下，对相对大的团簇计算格林函数、自能和态密度。证明了团簇系统中赝能隙的出现，且表明在临界温度以上对波动场的积分等同于零模阶梯图的求和。对于大的层状系统，在将层间耦合视为静态U(1)对称性破缺场的团簇方案中获得了态密度中的赝能隙。
英文摘要
We consider the layered attractive Hubbard model with a moderate interaction strength at quarter filling. The Green's function, self-energy, and density of states are calculated for relatively large clusters using the fluctuating local field method within the approximation of vanishing effective interaction. The emergence of a pseudogap is demonstrated for the cluster system, and it is shown that integration over the fluctuating field is equivalent to the summation of zero-mode ladder diagrams above critical temperature. For the large layered system, a pseudogap in the density of states is obtained within a cluster scheme that treats the coupling between layers as a static $U(1)$ symmetry-breaking field.
