Raman spectra of misoriented bilayer graphene

TL;DR

This study compares Raman spectra of single-layer graphene and misoriented bilayer graphene, revealing similar 2D band features and differing excitation energy dependence, indicating similar electronic structures despite layer misorientation.

Contribution

It demonstrates that misoriented bilayer graphene has Raman features similar to single-layer graphene, challenging previous assumptions about layer stacking effects.

Findings

2D band profiles are similar in single and misoriented bilayer graphene

The 2D band has only one component in misoriented bilayers

The dependence of 2D frequency on laser energy differs between systems

Abstract

We compare the main feature of the measured Raman scattering spectra from single layer graphene with a bilayer in which the two layers are arbitrarily misoriented. The profiles of the 2D bands are very similar having only one component, contrary to the four found for commensurate Bernal bilayers. These results agree with recent theoretical calculations and point to the similarity of the electronic structures of single layer graphene and misoriented bilayer graphene. Another new aspect is that the dependance of the 2D frequency on the laser excitation energy is different in these two latter systems.