Superconducting Gap, Normal State Pseudogap and Tunnelling Spectra of Bosonic and Cuprate Superconductors

TL;DR

This paper develops a theoretical framework for tunnelling spectra in bosonic and cuprate superconductors, explaining features like two energy scales, asymmetry, and inhomogeneity related to strong correlations and disorder.

Contribution

It introduces a comprehensive theory that incorporates coherence effects, disorder, and multiple energy scales to explain tunnelling phenomena in bosonic and cuprate superconductors.

Findings

Explains asymmetry and inhomogeneity in tunnelling spectra.

Accounts for temperature and doping dependencies of energy scales.

Provides a unified description of NS and SS tunnelling in strongly correlated superconductors.

Abstract

We develop a theory of normal-metal - superconductor (NS) and superconductor - superconductor (SS) tunnelling in bosonic superconductors with strong attractive correlations taking into account coherence effects in single-particle excitation spectrum and disorder. The theory accounts for the existence of two energy scales, their temperature and doping dependencies, asymmetry and inhomogeneity of tunnelling spectra of underdoped cuprate superconductors.