Josephson current carried by Andreev levels in superconducting quantum point contacts |
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Authors: | Akira Furusaki |
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Institution: | Department of Physics, Stanford University, Stanford, CA 94305-4060, U.S.A. |
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Abstract: | The dc Josephson effect in a superconducting quantum point contact, where supercurrent flows through a small number of channels, is reviewed. The central role of Andreev levels is emphasized which carry the whole supercurrent in short symmetric Josephson junctions including tunnel junctions. A simple intuitive view of the dc Josephson effect in a quantum point contact is given in terms of multiple Andreev reflections. The quantization of the critical current in superconducting quantum point contacts is briefly discussed. |
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