期刊名称：Journal of Pure and Applied Science and Technology
印刷版ISSN：2231-4202
电子版ISSN：2249-9970
出版年度：2018
卷号：2018
页码：9-17
语种：English
出版社：Natthan Lal Sevarth Samiti
摘要：The present paper deals with the study of Josephson supercurrent across the correlated single level quantum dot sandwiched between two s-wave superconductors. The renormalized Anderson model is used that includes in the Hamiltonian contribution corresponding to the correlated superconducting quantum dot state, effective BCS type attractive interaction in the superconducting leads, the electron tunneling energy term responsible for coupling of superconducting leads with the dot energy level thatrepresents the tunneling of Cooper pair between two superconductors and on-dot coulomb energy to take care of electronic correlations. The Green’s function equations of motion technique are employed within the framework of Ambegaokar-Baratoff approach to analyze the Josephson supercurrent across such junction. It is pointed out that for large value of on-dot Coulomb energy, the Josephson supercurrent across superconducting Quantum dot (S-QD-S) junction decreases.
