Quantum Dot between two Superconductors

Details Quantum Dot between two Superconductors Quantum Dot between two Superconductors

2000-04-02

arxiv.org/abs/cond-mat/0004008v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 two column pages including 1 eps figure

Scientific paper

10.1209/epl/i2001-00340-1

Novel effects emerge from an interplay between multiple Andreev reflections and Coulomb interaction in quantum dot coupled to superconducting leads and subject to a finite potential bias $V$. Combining an intuitive physical picture with rigorous path integral formalism we evaluate the current $I$ through the dot and find that the interaction shifts the subharmonic pattern of the $I-V$ curve is shifted toward higher $V$. For sufficiently ^M strong interaction the subgap current (at $eV < 2 \Delta$) is virtually suppressed.

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