Addressing Raman features of individual layers in isotopically labeled Bernal stacked bilayer graphene

TL;DR

This paper investigates the Raman spectral features of bilayer graphene, distinguishing contributions from individual layers, which aids in analyzing strain and layer-specific properties in isotopically labeled graphene systems.

Contribution

It introduces a method to disentangle the Raman features of individual layers in Bernal-stacked bilayer graphene, enhancing layer-specific analysis capabilities.

Findings

Raman features have three components from top, bottom, and combined layers.

Disentangling of 2D and 2D prime mode components achieved.

Enables layer-specific property analysis in isotopically labeled graphene.

Abstract

The most important bands for the evaluation of strain in graphene (the 2D and 2D prime modes) are investigated. It is shown that for Bernal-stacked bilayers, the two-phonon Raman features have three different components that can be assigned to processes originating solely from the top graphene layer, bottom graphene layer, and from a combination of processes originating both from the top and bottom layers. The individual components of the 2D and 2D prime modes are disentangled. The reported results enable addressing the properties of individual graphene layers in isotopically labelled turbostratic and Bernalstacked graphene systems.