Kekule-distortion-induced Exciton instability in graphene

TL;DR

This paper investigates how Kekule lattice distortions influence exciton instability in graphene, revealing that electron mass generation is unaffected by distortion amplitude at one-loop level, but exciton formation depends directly on the distortion.

Contribution

It provides a theoretical analysis of exciton instability in graphene due to Kekule distortion using quantum electrodynamics and Schwinger-Dyson equations.

Findings

Electron mass is independent of distortion amplitude at one-loop approximation.

Exciton formation depends directly on the Kekule lattice distortion.

The study offers insights into lattice distortion effects on electronic properties of graphene.

Abstract

Effects of a Kekule distortion on exciton instability in single-layer graphene are discussed. In the framework of quantum electrodynamics the mass of the electron generated dynamically is worked out using a Schwinger-Dyson equation. For homogeneous lattice distortion it is shown that the generated mass is independent of the amplitude of the lattice distortion at the one-loop approximation. Formation of excitons induced by the homogeneous Kekule distortion could appear only through direct dependence of the lattice distortion.