Superconducting Fluctuations in a Tight Binding Bandstructure

TL;DR

This paper calculates superconducting fluctuations in a tight binding bandstructure, revealing anisotropic pseudogap behavior on the Fermi surface that resembles observations in high-temperature superconductors.

Contribution

It provides a theoretical analysis of normal state fluctuations and pseudogap phenomena in a tight binding model, highlighting anisotropic effects.

Findings

Spectral weight becomes anisotropic on the Fermi surface.

Pseudogap appears near the (pi,0) point for certain chemical potentials.

Pseudogap behavior resembles that observed in high-temperature superconductors.

Abstract

Normal state superconducting fluctuations are calculated for the case of a tight binding bandstructure. The resulting electronic self energy and spectral weight are anisotropic on the Fermi surface. For certain values of the chemical potential $\mu$, the onset of a pseudogap is present in the spectral weight for Fermi surface momenta near the (pi,0) point in the 1st Brillouin Zone, and absent for momenta closer to the zone diagonal. The pseudogap in the normal state of high temperature superconductors shows similar behavior.