Josephson current in strongly correlated double quantum dots

Rok Žitko, Minchul Lee, Rosa López, Ramón Aguado, Mahn Soo Choi

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We study the Josephson current through a serial double quantum dot and the associated 0-π transitions which result from the subtle interplay between the superconductivity, the Kondo physics, and the interdot superexchange interaction. The competition between them is examined by tuning the relative strength Δ/TK of the superconducting gap and the Kondo temperature, for different strengths of the superexchange coupling determined by the interdot tunneling t relative to the level broadening Γ. We find strong renormalization of t, a significant role of the superexchange coupling J, and a rich phase diagram of the 0 and π-junction regimes. In particular, when both the superconductivity and the exchange interaction compete with the Kondo physics (Δ∼J∼TK), there appears an island of π phase at large values of the superconducting phase difference.

Original languageEnglish
Article number116803
JournalPhysical review letters
Volume105
Issue number11
DOIs
Publication statusPublished - 2010 Sep 8

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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