Quantum Hall conductance of two-terminal graphene devices

TL;DR

This paper compares experimental measurements and theoretical models of two-terminal conductance in monolayer and bilayer graphene under quantum Hall conditions, highlighting features that distinguish different graphene types and discussing discrepancies.

Contribution

It provides a detailed comparison of measurement and theory for quantum Hall conductance in graphene, identifying key features and potential causes of discrepancies.

Findings

Good agreement between measurement and theory generally

Distinct conductance features differentiate monolayer and bilayer graphene

Discussion of possible origins for observed discrepancies

Abstract

Measurement and theory of the two-terminal conductance of monolayer and bilayer graphene in the quantum Hall regime are compared. We examine features of conductance as a function of gate voltage that allow monolayer, bilayer, and gapped samples to be distinguished, including N-shaped distortions of quantum Hall plateaus and conductance peaks and dips at the charge neutrality point. Generally good agreement is found between measurement and theory. Possible origins of discrepancies are discussed.