Charge and Phase Fluctuations in Attractive Hubbard Model

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.

arXiv comment4 pages, 2 figures, Physica C (accepted)

References in corpus (4)

• The pseudogap in high-temperature superconductors: an experimental survey
• Non-linear feedback effects in coupled Boson-Fermion systems
• Effect of Disorder on Charge Density Wave and Superconducting Order in the Half-Filled Attractive Hubbard Model
• Effects of diagonal disorder on Charge Density Wave and Superconductivity in local pair systems