Quantum hall effect and quantum point contact in bilayer-patched epitaxial graphene

Cassandra Chua; Malcolm Connolly; Arseniy Lartsev; Tom Yager; Samuel Lara-Avila; Sergey Kubatkin; Sergey Kopylov; Vladimir Fal'Ko; Rositza Yakimova; Ruth Pearce; T. J B M Janssen; Alexander Tzalenchuk; Charles Smith

doi:10.1021/nl5008757

Quantum hall effect and quantum point contact in bilayer-patched epitaxial graphene

Cassandra Chua^*, Malcolm Connolly, Arseniy Lartsev, Tom Yager, Samuel Lara-Avila, Sergey Kubatkin, Sergey Kopylov, Vladimir Fal'Ko, Rositza Yakimova, Ruth Pearce, T. J B M Janssen, Alexander Tzalenchuk, Charles Smith

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

We study an epitaxial graphene monolayer with bilayer inclusions via magnetotransport measurements and scanning gate microscopy at low temperatures. We find that bilayer inclusions can be metallic or insulating depending on the initial and gated carrier density. The metallic bilayers act as equipotential shorts for edge currents, while closely spaced insulating bilayers guide the flow of electrons in the monolayer constriction, which was locally gated using a scanning gate probe.

Original language	English
Pages (from-to)	3369-3373
Number of pages	5
Journal	Nano Letters
Volume	14
Issue number	6
DOIs	https://doi.org/10.1021/nl5008757
Publication status	Published - 11 Jun 2014

Keywords

monolayer and bilayer graphene
quantum hall effect
quantum point contact
resistance metrology
scanning gate microscopy
SiC epitaxial graphene

Research Beacons, Institutes and Platforms

National Graphene Institute

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10.1021/nl5008757

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title = "Quantum hall effect and quantum point contact in bilayer-patched epitaxial graphene",

abstract = "We study an epitaxial graphene monolayer with bilayer inclusions via magnetotransport measurements and scanning gate microscopy at low temperatures. We find that bilayer inclusions can be metallic or insulating depending on the initial and gated carrier density. The metallic bilayers act as equipotential shorts for edge currents, while closely spaced insulating bilayers guide the flow of electrons in the monolayer constriction, which was locally gated using a scanning gate probe.",

keywords = "monolayer and bilayer graphene, quantum hall effect, quantum point contact, resistance metrology, scanning gate microscopy, SiC epitaxial graphene",

author = "Cassandra Chua and Malcolm Connolly and Arseniy Lartsev and Tom Yager and Samuel Lara-Avila and Sergey Kubatkin and Sergey Kopylov and Vladimir Fal'Ko and Rositza Yakimova and Ruth Pearce and Janssen, {T. J B M} and Alexander Tzalenchuk and Charles Smith",

year = "2014",

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doi = "10.1021/nl5008757",

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journal = "Nano Letters",

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TY - JOUR

T1 - Quantum hall effect and quantum point contact in bilayer-patched epitaxial graphene

AU - Chua, Cassandra

AU - Connolly, Malcolm

AU - Lartsev, Arseniy

AU - Yager, Tom

AU - Lara-Avila, Samuel

AU - Kubatkin, Sergey

AU - Kopylov, Sergey

AU - Fal'Ko, Vladimir

AU - Yakimova, Rositza

AU - Pearce, Ruth

AU - Janssen, T. J B M

AU - Tzalenchuk, Alexander

AU - Smith, Charles

PY - 2014/6/11

Y1 - 2014/6/11

N2 - We study an epitaxial graphene monolayer with bilayer inclusions via magnetotransport measurements and scanning gate microscopy at low temperatures. We find that bilayer inclusions can be metallic or insulating depending on the initial and gated carrier density. The metallic bilayers act as equipotential shorts for edge currents, while closely spaced insulating bilayers guide the flow of electrons in the monolayer constriction, which was locally gated using a scanning gate probe.

AB - We study an epitaxial graphene monolayer with bilayer inclusions via magnetotransport measurements and scanning gate microscopy at low temperatures. We find that bilayer inclusions can be metallic or insulating depending on the initial and gated carrier density. The metallic bilayers act as equipotential shorts for edge currents, while closely spaced insulating bilayers guide the flow of electrons in the monolayer constriction, which was locally gated using a scanning gate probe.

KW - monolayer and bilayer graphene

KW - quantum hall effect

KW - quantum point contact

KW - resistance metrology

KW - scanning gate microscopy

KW - SiC epitaxial graphene

UR - http://www.scopus.com/inward/record.url?scp=84902276837&partnerID=8YFLogxK

U2 - 10.1021/nl5008757

DO - 10.1021/nl5008757

M3 - Article

AN - SCOPUS:84902276837

SN - 1530-6984

VL - 14

SP - 3369

EP - 3373

JO - Nano Letters

JF - Nano Letters

IS - 6

ER -

Quantum hall effect and quantum point contact in bilayer-patched epitaxial graphene

Abstract

Keywords

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