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Anomalous Josephson effect between even- and odd-frequency superconductors.

Yukio Tanaka1, Alexander A Golubov, Satoshi Kashiwaya

  • 1Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan.

Physical Review Letters
|August 7, 2007
PubMed
Summary

Lowest-order Josephson coupling is achievable between odd- and even-frequency superconductors, challenging existing theories. This occurs due to induced pairing components at their interface, resulting in a specific current-phase relation.

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity Theory

Background:

  • Standard understanding posits limitations on Josephson coupling between superconductors with different frequency pairings.
  • Josephson coupling is a fundamental phenomenon in superconductivity, crucial for quantum devices.

Purpose of the Study:

  • To investigate the possibility of Josephson coupling between odd- and even-frequency superconductors.
  • To elucidate the underlying mechanism for such coupling and characterize the resulting current-phase relation.

Main Methods:

  • Theoretical analysis of superconducting interfaces.
  • Modeling of induced pairing components at the junction of odd- and even-frequency superconductors.

Main Results:

  • Demonstrated that Josephson coupling is possible between odd- and even-frequency superconductors, contradicting conventional wisdom.
  • Identified the origin as induced odd- (even-)frequency pairing components at the interface of bulk even- (odd-)frequency superconductors.
  • Determined the current-phase relation to be proportional to cos(phi), where phi is the macroscopic phase difference.

Conclusions:

  • The study challenges established theories regarding Josephson coupling limitations.
  • The findings open new avenues for exploring unconventional superconducting heterostructures.
  • The characterized current-phase relation provides a basis for potential applications in superconducting electronics.