# Epitaxial graphene

## TL;DR

Epitaxial graphene grown on silicon carbide exhibits unique electronic properties such as Dirac fermions, high mobility, and potential for room-temperature nanoelectronic devices, despite lacking quantum Hall effects.

## Contribution

This paper provides a comprehensive characterization of epitaxial graphene's electronic properties and highlights its potential for high-speed nanoelectronics applications.

## Key findings

- Graphene layers are electron doped due to built-in electric fields.
- Charge carriers exhibit Dirac particle properties.
- Quantum Hall effect is absent in high mobility epitaxial graphene.

## Abstract

Graphene multilayers are grown epitaxially on single crystal silicon carbide. This system is composed of several graphene layers of which the first layer is electron doped due to the built-in electric field and the other layers are essentially undoped. Unlike graphite the charge carriers show Dirac particle properties (i.e. an anomalous Berry's phase, weak anti-localization and square root field dependence of the Landau level energies). Epitaxial graphene shows quasi-ballistic transport and long coherence lengths; properties which may persists above cryogenic temperatures. Paradoxically, in contrast to exfoliated graphene, the quantum Hall effect is not observed in high mobility epitaxial graphene. It appears that the effect is suppressed due to absence of localized states in the bulk of the material.Epitaxial graphene can be patterned using standard lithography methods and characterized using a wide array of techniques. These favorable features indicate that interconnected room temperature ballistic devices may be feasible for low dissipation high-speed nanoelectronics.