Josephson Current in Strongly Correlated Double Quantum Dots
- Authors
- Zitko, Rok; Lee, Minchul; Lopez, Rosa; Aguado, Ramon; Choi, Mahn-Soo
- Issue Date
- 8-9월-2010
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW LETTERS, v.105, no.11
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW LETTERS
- Volume
- 105
- Number
- 11
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/115691
- DOI
- 10.1103/PhysRevLett.105.116803
- ISSN
- 0031-9007
- Abstract
- We study the Josephson current through a serial double quantum dot and the associated 0 - pi 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 Delta/T(K) 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 Gamma. We find strong renormalization of t, a significant role of the superexchange coupling J, and a rich phase diagram of the 0 and pi-junction regimes. In particular, when both the superconductivity and the exchange interaction compete with the Kondo physics (Delta similar to J similar to T(K)), there appears an island of pi' phase at large values of the superconducting phase difference.
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