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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Giant proximity effect in a phase-fluctuating superconductor.

Dominic Marchand1, Lucian Covaci, Mona Berciu

  • 1Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, Canada V6T 1Z1.

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|October 15, 2008
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Summary

A novel proximity effect in superconductors can greatly enhance the Josephson effect when a normal material barrier is used. This finding may explain recent observations of a giant proximity effect in cuprate superconductors.

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Area of Science:

  • Condensed matter physics
  • Superconductivity research

Background:

  • Josephson effect is a quantum mechanical phenomenon occurring between two superconductors separated by a thin insulating or normal metal barrier.
  • Proximity effect describes the influence of a superconductor on an adjacent normal material, inducing superconductivity in it.

Purpose of the Study:

  • To establish a novel proximity effect that enhances the Josephson effect.
  • To investigate the underlying mechanisms of the giant proximity effect observed in cuprate superconductors.

Main Methods:

  • Theoretical analysis using a general argument.
  • Numerical simulations to model the proximity effect.

Main Results:

  • Demonstrated an enormous enhancement of the Josephson effect under specific conditions.
  • Identified a novel proximity effect involving a normal material barrier that would otherwise be superconducting.

Conclusions:

  • The novel proximity effect can significantly enhance superconducting properties.
  • This effect may explain recent experimental findings of a giant proximity effect in cuprate superconductors separated by an underdoped barrier.