Two-gap superconductivity: interband interaction in the role of external field

TL;DR

This paper demonstrates that weak interband interactions in two-gap superconductors act like an external field, influencing the weaker superconducting component similarly to magnetic or electric fields in other systems.

Contribution

It introduces the concept that interband pair-transfer acts as an external field affecting the weaker superconducting gap in two-gap systems.

Findings

Interband interaction influences the weaker superconducting component.

The effect is analogous to external fields in ferromagnetics and ferroelectrics.

Weak interband coupling can modify superconducting properties.

Abstract

We show that weak interband pair-transfer interaction affects weaker-superconductivity component of a two-gap system as an external field associated with the order parameter, similarly to an external magnetic field for ferromagnetics or an external electric field for ferroelectrics.