Probing the Electronic Structure of Bilayer Graphene by Raman Scattering

TL;DR

This study uses resonant Raman scattering with various laser energies to explore bilayer graphene's electronic structure, measuring key parameters and phonon branch splitting, which impact electronic device applications.

Contribution

It provides new experimental measurements of the electronic parameters of bilayer graphene, revealing significant differences from graphite and analyzing phonon branch splitting.

Findings

Measured parameters of the Slonczewski-Weiss-McClure model for bilayer graphene.

Identified significant differences in effective mass parameters compared to graphite.

Observed splitting of the two TO phonon branches in bilayer graphene.

Abstract

The electronic structure of bilayer graphene is investigated from a resonant Raman study using different laser excitation energies. The values of the parameters of the Slonczewski-Weiss-McClure model for graphite are measured experimentally and some of them differ significantly from those reported previously for graphite, specially that associated with the difference of the effective mass of electrons and holes. The splitting of the two TO phonon branches in bilayer graphene is also obtained from the experimental data. Our results have implications for bilayer graphene electronic devices.