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Sharp superconductor-insulator transition in short wires.

Dganit Meidan1, Yuval Oreg, Gil Refael

  • 1Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, 76100, Israel.

Physical Review Letters
|May 16, 2007
PubMed
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Short superconducting wires exhibit a sharp transition to an insulating state, defying previous theories. This study explains this phenomenon using a novel renormalization-group approach for quantum phase slips.

Area of Science:

  • Condensed matter physics
  • Quantum phenomena
  • Materials science

Background:

  • Recent experiments revealed a sharp superconducting-insulating transition in short Molybdenum-Germanium (MoGe) nanowires.
  • This transition occurs at a universal resistance value, R(Q)=h/(4e^2), contradicting expectations for Josephson-like systems.

Purpose of the Study:

  • To theoretically explain the observed sharp superconducting-insulating transition in short MoGe nanowires.
  • To develop a model applicable to systems within the sine-Gordon universality class.

Main Methods:

  • A self-consistent renormalization-group treatment was employed.
  • The method focuses on the interactions of quantum phase slips in short superconducting wires.

Main Results:

Related Experiment Videos

  • The theoretical model successfully reproduces the sharp universal transition observed in experiments.
  • The approach accounts for the behavior in the intermediate-coupling regime.

Conclusions:

  • The study provides a theoretical framework for understanding the sharp superconducting-insulating transition in short superconducting wires.
  • The developed method is applicable to a broader range of systems exhibiting sine-Gordon universality.