Abstract
We analyze the effects of electron–electron interactions in a quantum dot coupled to superconducting leads. It is shown that subgap transport is suppressed in the presence of strong interactions. The order of suppression is enhanced as the applied voltage decreases. We discuss this effect by arguing that multiple Andreev reflections through a single quantum dot can be mapped onto the problem of a linear chain of quantum dots. We also show that the subgap harmonics in the current–voltage curve become complicated due to the discrete state in the quantum dot.
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