Tailoring 10 nm Scale Suspended Graphene Junctions and Quantum Dots

The possibility to make 10 nm scale, and low-disorder, suspended graphene devices would open up many possibilities to study and make use of strongly coupled quantum electronics, quantum mechanics, and optics. We present a versatile method, based on the electromigration of gold-on-graphene bow-tie br...

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Bibliographic Details
Published inNano letters Vol. 15; no. 1; pp. 114 - 119
Main Authors Tayari, Vahid, McRae, Andrew C, Yiğen, Serap, Island, Joshua O, Porter, James M, Champagne, Alexandre R
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 14.01.2015
Subjects
Channels
Devices
Electromigration
Gold
Graphene
Nanostructure
Nonuniform
Quantum dots
quantum dot
NEMS
ballistic
fabrication
graphene
suspended
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Summary:The possibility to make 10 nm scale, and low-disorder, suspended graphene devices would open up many possibilities to study and make use of strongly coupled quantum electronics, quantum mechanics, and optics. We present a versatile method, based on the electromigration of gold-on-graphene bow-tie bridges, to fabricate low-disorder suspended graphene junctions and quantum dots with lengths ranging from 6 nm up to 55 nm. We control the length of the junctions, and shape of their gold contacts by adjusting the power at which the electromigration process is allowed to avalanche. Using carefully engineered gold contacts and a nonuniform downward electrostatic force, we can controllably tear the width of suspended graphene channels from over 100 nm down to 27 nm. We demonstrate that this lateral confinement creates high-quality suspended quantum dots. This fabrication method could be extended to other two-dimensional materials.
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ISSN:1530-6984
1530-6992
DOI:10.1021/nl503151g