Abstract
We theoretically investigate the coherent mesoscopic transport and Andreev reflection in a normal-metal/quantum-dot/superconducting-film/normal-metal system by the use of the equivalent single-particle multi-channel network technique, where the Coulomb blockade in the quantum dot is considered. In the superconducting film the pairing can either be s-wave or d-wave described by the Bogoliubov–de Gennes Hamiltonian. The probability of the Andreev reflection in this structure for both s-wave and d-wave pairing is calculated. The results show coherent characteristics stemming from the spatial phase coherence of quasiparticles in finite thickness of the superconducting film. The curves of the current versus the gate voltage applied on the quantum dot exhibit several shape peaks associated with resonances of the quantum dot in the Coulomb blockade regime, also depending on the symmetry of pairing and on the orientation of the interfaces in the case of d-wave pairing.
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