How Graphene-like is Epitaxial Graphene? \\Quantum Oscillations and Quantum Hall Effect

TL;DR

This study demonstrates that epitaxial graphene on SiC exhibits quantum Hall effects and high mobility similar to exfoliated graphene, confirming its pseudo-relativistic electronic behavior.

Contribution

It provides comprehensive transport measurements showing epitaxial graphene's quantum Hall effect and high mobility, establishing its similarity to exfoliated graphene.

Findings

High mobility independent of sample size

Observation of Shubnikov-de Haas oscillations

Quantum Hall effect near the Dirac point

Abstract

We investigate the transport properties of high-quality single-layer graphene, epitaxially grown on a 6H-SiC(0001) substrate. We have measured transport properties, in particular charge carrier density, mobility, conductivity and magnetoconductance of large samples as well as submicrometer-sized Hall bars which are entirely lying on atomically flat substrate terraces. The results display high mobilities, independent of sample size and a Shubnikov-de Haas effect with a Landau level spectrum of single-layer graphene. When gated close to the Dirac point, the mobility increases substantially, and the graphene-like quantum Hall effect occurs. This proves that epitaxial graphene is ruled by the same pseudo-relativistic physics observed previously in exfoliated graphene.