Spin-Flip Effects on Current in a Quantum Dot with a Josephson Junction System
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概要
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In this study, we consider the current in a system composed of a superconductor/quantum dot/superconductor junction and a Josephson junction in a parallel configuration. In the model, the spin-flip and the Coulomb interaction in the quantum dot are taken into consideration. The effects of direct tunneling, the spin-flip, and the Coulomb interaction on current and the relation between the current jump and the formation of the \pi-junction are examined. The dependence of the current on the quantum dot energy level shows the Fano characteristics. The spin-flip causes the splitting of the Andreev bound state, thereby resulting in a current jump. The region of the \pi-junction is spread along the current jump positions. We conclude that the spin-flip causes the formation of the \pi-junction but direct tunneling suppresses it. For large values of spin-flip, the Coulomb interaction shifts the central position of the formed region of the \pi-junction.
- 2012-03-15
著者
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川口 聡
公立はこだて未来大学複雑系科学科
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Kawaguchi Satoshi
Department Of Complex Systems School Of Systems Information Science Future University
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Kawaguchi Satoshi
Department Of Bioscience And Biotechnology Graduate School Of Natural Science And Technology Okayama
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Kawaguchi Satoshi
Department Of Orthopaedic Surgery Asahikawa-kosei General Hospital
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Kawaguchi Satoshi
Department of Orthopaedic Surgery, Sapporo Medical University School of Medicine
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KAWAGUCHI Satoshi
Department of Complex Systems, School of Systems Information Science, Future University-Hakodate
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KAWAGUCHI Satoshi
Laboratory for Advanced Brain Signal Processing, Brain Science Institute, RIKEN
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Kawaguchi Satoshi
Department of Complex and Intelligent Systems, School of Systems Information Science, Future University Hakodate, Hakodate, Hokkaido 041-8655, Japan
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KAWAGUCHI Satoshi
Laboratory for Advanced Brain Signal Processing Brain Science Institute, RIKEN
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