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Understanding the Josephson current through a Kondo-correlated quantum dot.

D J Luitz1, F F Assaad, T Novotný

  • 1Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074 Würzburg, Germany.

Physical Review Letters
|September 26, 2012
PubMed
Summary
This summary is machine-generated.

We investigated the Josephson current 0-π transition in a quantum dot within the Kondo regime. Our findings quantitatively capture this phenomenon, showing excellent agreement with experimental data for critical Josephson current dependence.

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Area of Science:

  • Condensed matter physics
  • Quantum electronics

Background:

  • The Josephson current 0-π transition in quantum dots is a key phenomenon in superconductivity.
  • Understanding the interplay between Kondo correlations and superconductivity is crucial for quantum device development.

Purpose of the Study:

  • To quantitatively study the Josephson current 0-π transition of a quantum dot in the Kondo regime.
  • To compare theoretical predictions with experimental data and explore new regimes.

Main Methods:

  • Numerically exact continuous time quantum Monte Carlo method.
  • Application to the single-impurity Anderson model with Bardeen-Cooper-Schrieffer superconducting leads.
  • Fitting normal-state linear conductance to determine tunnel couplings.

Main Results:

  • Excellent agreement achieved for the critical Josephson current's dependence on level energy.
  • Kondo scale becomes comparable to the superconducting gap for increased tunnel couplings.
  • The regime of strongest competition between superconductivity and Kondo correlations is reached.

Conclusions:

  • The continuous time quantum Monte Carlo method accurately captures the Josephson current 0-π transition.
  • The study predicts the gate voltage dependence of the critical current in the regime of strong competition between Kondo correlations and superconductivity.