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Josephson effect throughout the BCS-BEC crossover.

A Spuntarelli1, P Pieri, G C Strinati

  • 1Dipartimento di Fisica, Università di Camerino, I-62032 Camerino, Italy.

Physical Review Letters
|August 7, 2007
PubMed
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We investigated the Josephson effect in neutral fermions near the BEC-BCS crossover. The Josephson current is enhanced at unitarity, approaching Landau limits determined by excitations.

Area of Science:

  • Condensed matter physics
  • Quantum mechanics

Background:

  • The study focuses on the stationary Josephson effect in neutral fermions.
  • It examines the behavior across the Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein condensate (BEC) crossover.

Purpose of the Study:

  • To numerically solve the Bogoliubov-de Gennes equations at zero temperature.
  • To analyze the Josephson current and critical current behavior.

Main Methods:

  • Numerical solution of Bogoliubov-de Gennes equations.
  • Zero-temperature analysis.

Main Results:

  • Josephson current is enhanced for all barriers near unitarity.
  • Critical current approaches Landau limiting values, influenced by pair-breaking or sound-mode excitations.

Related Experiment Videos

  • A method is proposed to extract the pairing gap from Landau limiting current.

    • Conclusions:

    • The BCS-BEC crossover significantly impacts the Josephson effect.
    • Understanding these excitations is key to predicting critical current behavior.