Numerical Renormalization Group Approach to a Quantum Dot Coupled to Normal and Superconducting Leads(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
- 論文の詳細を見る
We study transport through a quantum dot coupled to normal and superconducting leads using the numerical renormalization group method. We show that the low-energy properties of the system are described by the local Fermi liquid theory despite of the superconducting correlations penetrated into the dot due to a proximity effect. We calculate the linear conductance due to the Andreev reflection in the presence of the Coulomb interaction. It is demonstrated that the maximum structure appearing in the conductance clearly characterizes a crossover between two distinct spin-singlet ground states, i.e. the superconducting singlet state and the Kondo singlet state. It is further elucidated that the gate-voltage dependence of the conductance shows different behavior in the superconducting singlet region from that in the Kondo singlet region.
- 社団法人日本物理学会の論文
- 2007-07-15
著者
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Oguri Akira
Department Of Material Science Osaka City University
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Oguri Akira
Department Of Applied Physics Nagoya University
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KAWAKAMI Norio
Department of Applied Physics, Osaka University
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TANAKA Yoichi
Department of Dermatology, Nagasaki University
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Kawakami Norio
Department Of Applied Physics Osaka University
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Kawakami Norio
Department Of Physics Kyoto University
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Tanaka Yoichi
Department Of Applied Physics Osaka University
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