Superconductivity from four Fermion complexes

TL;DR

This paper investigates superconductivity arising from four-fermion complexes, deriving a gap equation and showing that the transition temperature can significantly exceed traditional BCS predictions under certain conditions.

Contribution

It introduces a theoretical framework for superconductivity driven by four-fermion interactions and calculates the resulting transition temperature.

Findings

Transition temperature is higher than BCS in four-fermion systems.

Derived a gap equation using Green function methods.

Superconductivity can be enhanced with comparable coupling constants.

Abstract

Superconductivity is studied for a fermionic system with attractive four-body interaction. Applying a Green function approach, the gap equation is derived. From the solution, the transition temperature is calculated. Under the condition that the respective coupling constants are comparable, the transition temperature of four-fermion complexes is considerably larger than the corresponding BCS value.