Band hybridization induced odd-frequency pairing in multiband superconductors

TL;DR

This paper explores how hybridization between two superconducting bands can induce odd-frequency pairing, altering the density of states and creating hybridization gaps with coherence peaks.

Contribution

It provides an explicit derivation of odd-frequency pairing correlations and analyzes their impact on the density of states in multiband superconductors.

Findings

Hybridization induces odd-frequency pairing.

Density of states shows hybridization gaps.

Coherence peaks are enhanced with odd-frequency pairing.

Abstract

We investigate how hybridization (single-quasiparticle scattering) between two superconducting bands induces odd-frequency superconductivity in a multiband superconductor. An explicit derivation of the odd-frequency pairing correlation and its full frequency dependence is given. We find that the density of states is modified, from the sum of the two BCS spectra, at higher energies by additional hybridization gaps with strong coherence peaks when odd-frequency pairing is present.