Magneto-transmission of multi-layer epitaxial graphene and bulk graphite: A comparison

TL;DR

This study compares magneto-transmission spectra of multilayer epitaxial graphene and bulk graphite, highlighting the Dirac fermion signatures and emphasizing the different dimensional models needed for interpretation.

Contribution

It provides a comparative analysis of magneto-transmission in graphene and graphite, demonstrating the applicability of 2D and 3D models respectively for their spectral features.

Findings

Dirac fermion signatures observed in both materials

2D Dirac fermion model explains epitaxial graphene data

3D model necessary for bulk graphite data

Abstract

Magneto-transmission of a thin layer of bulk graphite is compared with spectra taken on multilayer epitaxial graphene prepared by thermal decomposition of a SiC crystal. We focus on the spectral features evolving as \sqrt{B}, which are evidence for the presence of Dirac fermions in both materials. Whereas the results on multi-layer epitaxial graphene can be interpreted within the model of 2D Dirac fermions, the data obtained on bulk graphite can only be explained taking into account the 3D nature of graphite, e.g. by using the standard Slonczewski-Weiss-McClure model.