Tailoring 10 nm Scale Suspended Graphene Junctions and Quantum Dots

被引：7

作者：

Tayari, Vahid ^{[1
]}

McRae, Andrew C. ^{[1
]}

Yigen, Serap ^{[1
]}

Island, Joshua O. ^{[1
]}

Porter, James M. ^{[1
]}

Champagne, Alexandre R. ^{[1
]}

机构：

[1] Concordia Univ, Dept Phys, Montreal, PQ H4B 1R6, Canada

来源：

NANO LETTERS | 2015年 / 15卷 / 01期

基金：

加拿大自然科学与工程研究理事会;

关键词：

graphene; suspended; ballistic; quantum dot; fabrication; NEMS; ELECTROMIGRATION; TRANSISTORS; RESONATORS; ELECTRODES; TRANSPORT; SYSTEMS; STATE; FIELD;

D O I：

10.1021/nl503151g

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：114 / 119

页数：6

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