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Gate-defined quantum confinement in suspended bilayer graphene.

M T Allen¹, J Martin, A Yacoby

¹Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.

Nature Communications

|July 5, 2012

Summary

Researchers developed a new method for creating high-quality quantum-confined devices in suspended bilayer graphene. This technique overcomes limitations of previous methods, enabling precise control over electron behavior for advanced nanoelectronics.

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Area of Science:

Condensed Matter Physics
Nanoscience and Nanotechnology
Quantum Electronics

Background:

Single-electron manipulation in graphene is crucial for next-generation nanoelectronics.
Existing methods using etched graphene nanostructures suffer from significant limitations due to edge and substrate disorder.
Disorder in graphene nanostructures impedes reliable device functionality and limits potential applications.

Purpose of the Study:

To develop a novel technique for fabricating high-quality quantum-confined structures in graphene.
To eliminate detrimental edge and substrate disorder in graphene-based quantum devices.
To demonstrate precise electrostatic control over graphene's band structure for quantum confinement.

Main Methods:

Utilized suspended bilayer graphene to avoid substrate interactions.
Created tunable tunnel barriers using external electric fields to open a bandgap.
Investigated quantum dot formation in two distinct regimes: zero magnetic field (B=0) and quantum Hall regime (B>0).

Main Results:

Achieved clean quantum dot formation in suspended bilayer graphene, free from edge and substrate disorder.
Demonstrated quantum dot formation at zero magnetic field via electric-field-induced bandgap.
Observed Coulomb blockade oscillations consistent with electrostatic simulations, confirming local control over graphene's band structure.

Conclusions:

The developed technique enables the creation of high-quality quantum-confined devices in graphene.
This method offers precise electrostatic control over graphene's band structure, overcoming previous limitations.
The technology facilitates single-electron transport and opens avenues for electromechanical sensors and quantum bits.