Charge and Phase Fluctuations in Attractive Hubbard Model
Grzegorz Litak (Technical University of Lublin)
TL;DR
This paper investigates how charge and phase fluctuations in the negative U Hubbard model influence the normal state properties of superconductors, revealing their role in pseudogap formation and phase transitions.
Contribution
It provides a detailed analysis of charge and phase fluctuations as precursors to superconductivity and charge density waves within the negative U Hubbard model.
Findings
Charge and phase fluctuations occur above the critical temperature.
Fluctuations lead to pseudogap opening in the density of states.
Fluctuations depend on band filling and influence phase transitions.
Abstract
Using the negative U Hubbard model we analyze normal state properties of a superconductor. In this model there exists a characteristic pairing temperature T_P above a superconducting critical temperature. Below T_P electrons start to form incoherent pairs. The fluctuations in charge and phase are precursors of charge density wave and superconductivity phases depending on band filling. They lead naturally to pseudogap opening in the density of states.
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