Superconductivity-induced features in electronic Raman spectrum of monolayer graphene

TL;DR

This paper theoretically explores how superconductivity affects the electronic Raman spectrum of monolayer graphene, revealing a characteristic peak related to the superconducting gap.

Contribution

It introduces a continuum model analysis of electronic excitations in superconducting monolayer graphene, identifying a new Raman peak linked to the superconducting gap.

Findings

Raman peak appears at energy corresponding to the superconducting gap.

Peak intensity scales with the square root of the gap and the cube of the Fermi level.

Estimated quantum efficiency of the Raman peak is approximately 10^{-14}.

Abstract

Using the continuum model, we investigate theoretically contribution of the low-energy electronic excitations to the Raman spectrum of superconducting monolayer graphene. We consider superconducting phases characterised by an isotropic order parameter in a single valley and find a Raman peak at a shift set by the size of the superconducting gap. The height of this peak is proportional to the square root of the gap and the third power of the Fermi level, and we estimate its quantum efficiency as $I\sim10^{-14}$.