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Tailoring 10 nm scale suspended graphene junctions and quantum dots
Vahid Tayari1, Andrew C McRae, Serap Yiğen
1Department of Physics, Concordia University , Montréal, Québec H4B 1R6, Canada.
Nano Letters
|December 10, 2014
Summary
Researchers developed a new method to create small, high-quality suspended graphene devices. This technique uses electromigration to precisely control the size and shape of graphene junctions and quantum dots for advanced quantum electronics research.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Quantum Electronics
Background:
- Suspended graphene devices are crucial for studying quantum phenomena.
- Fabricating such devices at the 10 nm scale with low disorder has been challenging.
Purpose of the Study:
- To present a versatile method for fabricating low-disorder, suspended graphene junctions and quantum dots.
- To enable the study of strongly coupled quantum electronics, quantum mechanics, and optics.
Main Methods:
- Electromigration of gold-on-graphene bow-tie bridges.
- Controlled avalanche of electromigration to adjust junction length (6-55 nm).
- Engineered gold contacts and electrostatic force for width control (down to 27 nm).
Main Results:
- Successful fabrication of low-disorder suspended graphene junctions and quantum dots.
- Precise control over junction length and gold contact shape.
- Demonstrated lateral confinement creating high-quality suspended quantum dots.
Conclusions:
- The presented electromigration method is effective for creating nanoscale suspended graphene devices.
- This technique facilitates the study of quantum phenomena in graphene.
- The method shows potential for application to other two-dimensional materials.
