Quantum Hall effect in gapped graphene heterojunctions

J. L. Lado*, J. W. González, J. Fernández-Rossier

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

16 Citations (Scopus)

Abstract

We model the quantum Hall effect in heterostructures made of two gapped graphene stripes with different gaps, Δ1 and Δ2. We consider two main situations, Δ1=0, Δ2≠0, and Δ1=-Δ2. They are different in a fundamental aspect: only the latter features kink states that, when intervalley coupling is absent, are protected against backscattering. We compute the two-terminal conductance of heterostructures with channel length up to 430 nm, in two transport configurations, parallel and perpendicular to the interface. By studying the effect of disorder on the transport along the boundary, we quantify the robustness of kink states with respect to backscattering. Transport perpendicular to the boundary shows how interface states open a backscattering channel for the conducting edge states, spoiling the perfect conductance quantization featured by the homogeneously gapped graphene Hall bars. Our results can be relevant for the study of graphene deposited on hexagonal boron-nitride, as well as to model graphene with an interaction-driven gapped phase with two equivalent phases separated by a domain wall.

Original languageEnglish
Article number035448
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number3
DOIs
Publication statusPublished - 31 Jul 2013
MoE publication typeA1 Journal article-refereed

Fingerprint

Dive into the research topics of 'Quantum Hall effect in gapped graphene heterojunctions'. Together they form a unique fingerprint.

Cite this