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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

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Pumped shot noise in adiabatically modulated graphene-based double-barrier structures.

Rui Zhu¹, Maoli Lai

¹Department of Physics, South China University of Technology, Guangzhou 510641, People's Republic of China. rzhu@scut.edu.cn

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|November 1, 2011

Summary

Quantum pumping in graphene double-barrier structures generates significant quantum noise. This noise dramatically increases when the current direction reverses, revealing the Klein paradox effect.

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Area of Science:

Condensed matter physics
Quantum electronics
Materials science

Background:

Quantum pumping processes are inherently linked to quantum noise.
Graphene-based heterostructures offer unique electronic properties for quantum device applications.

Purpose of the Study:

Investigate the pumped shot noise in adiabatically modulated graphene-based double-barrier structures.
Analyze the influence of current direction reversal on quantum noise properties.

Main Methods:

Utilized a scattering approach to model quantum transport.
Investigated adiabatically modulated graphene double-barrier systems.
Analyzed shot noise characteristics under varying current flow directions.

Main Results:

Observed a dramatic enhancement in pumped shot noise when the direct current (dc) pumped current changes flow direction.
Shot noise properties deviate significantly from Poissonian predictions in these scenarios.
The observed noise enhancement is attributed to the unique relativistic effects in graphene, specifically the Klein paradox.

Conclusions:

The study highlights the significant role of quantum noise in quantum pumping phenomena.
The dramatic noise enhancement near current direction reversal serves as a clear signature of the Klein paradox in graphene.
Findings provide insights into the quantum transport mechanisms in graphene-based nanostructures.