Interplay between uniaxial strain and magnetophonon resonance in graphene

TL;DR

This paper investigates how uniaxial strain affects the phonon G peak in graphene's Raman spectra under magnetic fields, revealing complex splitting and polarization-dependent features during magnetophonon resonance.

Contribution

It provides new insights into the interplay between strain and magnetophonon resonance, showing how strain modifies spectral line shapes and polarization dependencies in graphene.

Findings

Multiple splitting of the phonon G peak under MPR

Polarization dependence of spectral features

Modification of anticrossing branches due to strain

Abstract

We study the fine structure of the phonon G peak in the inelastic light scattering spectra of strained graphene in the presence of a quantizing magnetic field. We show that under the conditions of the magnetophonon resonance (MPR), the spectral line shape in Raman spectra of the \Gamma-point longitudinal optic-transverse optical phonon undergoes multiple splitting and acquires a strong dependence on the polarization of the incoming and detected light. Interference of strain and MPR leads to the modification of the anticrossing branches, introducing the variation of the light polarization preferences depending on the proximity to the resonance, and their better resolution between neighboring anticrossings.