Theory of Josephson effect in strongly correlated electron systems

Takehito Yokoyama, Seiichiro Onari, Yukio Tanaka

Research output: Contribution to journalArticle

Abstract

We study Josephson effect in superconducting junction based on the repulsive Hubbard model on the square lattice with the fluctuation exchange approximation and the recursive Green's function method. It is shown that the proximity effect is suppressed by the repulsive interaction in the normal metal, and consequently Josephson current in superconductor/normal metal/superconductor junction is reduced due to the strong correlation effect. This is because the imaginary part of the self energy, which facilitates the damping effect, grows with the repulsive interaction.

Original languageEnglish
Pages (from-to)S884-S885
JournalPhysica C: Superconductivity and its applications
Volume470
Issue numberSUPPL.1
DOIs
Publication statusPublished - Dec 1 2010

Keywords

  • Fluctuation exchange approximation
  • Josephson effect
  • Repulsive Hubbard model

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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