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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Adiabatic quantum pumping at the Josephson frequency.

S Russo1, J Tobiska, T M Klapwijk

  • 1Kavli Institute of Nanoscience, Faculty of Applied Science, Delft University of Technology, Lorentzweg 1, 2628 CJ, Delft, The Netherlands.

Physical Review Letters
|October 13, 2007
PubMed
Summary

We theoretically analyzed adiabatic quantum pumping in superconductor-normal metal-superconductor Josephson junctions. The study demonstrates that superconducting phase manipulation can drive a significant charge flow, enabling high-frequency operation and nanoampere currents.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Superconductivity

Background:

  • Superconductor-normal metal-superconductor (S-N-S) Josephson junctions are key components in superconducting electronics.
  • Adiabatic quantum pumping offers a method for charge transport control.
  • Understanding charge flow in mesoscopic superconducting devices is crucial for quantum technologies.

Purpose of the Study:

  • To theoretically investigate adiabatic quantum pumping through a normal conductor connecting two S-N-S Josephson junctions.
  • To explore the use of superconducting order parameter phases as pumping parameters.
  • To determine the feasibility of generating a non-zero pumped charge and current.

Main Methods:

  • Theoretical analysis of adiabatic quantum pumping.
  • Modeling charge transport in S-N-S Josephson junctions.
  • Utilizing the ac Josephson effect for phase manipulation.

Main Results:

  • Demonstrated that a non-zero pumped charge can flow through the device by manipulating superconducting phases.
  • Showcased the device's ability to operate at very high frequencies.
  • Predicted achievable pumped currents on the order of a few nanoamperes.

Conclusions:

  • Adiabatic quantum pumping is a viable mechanism for generating directed charge flow in S-N-S Josephson junction systems.
  • The proposed device offers high-frequency operation potential for superconducting electronics.
  • The theoretical findings hold experimental relevance for advancing superconducting quantum devices.