Mesoscopic Josephson effect |
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| Institution: | 1. Fakultät für Physik, Albert-Ludwigs-Universität, Hermann-Herder-Straße 3, Freiburg, D-79104, Germany;2. Institut für Physik, Universität Augsburg, Universitätsstraße 1, D-86135, Augsburg, Germany;3. CEA, Service de Physique de l’Etat Condensé, Centre d’Etudes de Saclay, F-91191, Gif-sur-Yvette, France;1. Department of Materials Science, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan;2. Department of Mechanical Engineering, College of Engineering, Nihon University, 1 Nakagawara, Tokusada, Tamuramachi, Koriyama, Fukushima 963-8642, Japan;1. Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China;2. Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China;3. Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Science, Beijing 100190, China;1. Laboratoire de Physique et Modélisation des Milieux Condensés (UMR 5493), Université Grenoble Alpes and CNRS, Maison des Magistères, BP 166, 38042 Grenoble, France;2. Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, 28049 Madrid, Spain;3. JARA Institute for Quantum Information, RWTH Aachen University, D-52056 Aachen, Germany;4. Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, SE-41298 Göteborg, Sweden;1. Department of Physics, Zhejiang University, Hangzhou 310027, China;2. Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China;3. Department of Physics, Hangzhou Normal University, Hangzhou 310036, China |
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| Abstract: | In the classical Josephson effect the phase difference across the junction is well defined, and the supercurrent is reduced only weakly by phase diffusion. For mesoscopic junctions with small capacitance the phase undergoes large quantum fluctuations, and the current is also decreased by Coulomb blockade effects. We discuss the behavior of the current–voltage characteristics in a large range of parameters comprising the phase diffusion regime with coherent Josephson current as well as the supercurrent peak due to incoherent Cooper pair tunneling in the Coulomb blockade regime. |
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