Boundary problems for Dirac electrons and edge-assisted Raman scattering in graphene

TL;DR

This paper presents a theoretical analysis of how graphene edges influence electron scattering and Raman scattering, revealing the effects of edge roughness and polarization on Raman signals and electron dynamics.

Contribution

It introduces effective models for graphene edges and analyzes their impact on Raman D peak intensity and polarization dependence, advancing understanding of edge effects in graphene.

Findings

Edge roughness affects Raman D peak intensity

Polarization of light influences Raman scattering signals

Electron quasiclassical behavior impacts Raman scattering

Abstract

The paper reports a theoretical study of scattering of electrons by edges in graphene and its effect on Raman scattering. First, effective models are discussed for translationally invariant and rough edges. Second, they are used in a calculation of the edge-activated Raman D peak intensity and its dependence on the polarization of the incident/scattered light, as well as on the position of the excitation spot. Manifestations of the quasiclassical character of electron motion in Raman scattering are discussed.