Driven superconducting proximity effect in interacting quantum dots
Ali G. Moghaddam, Michele Governale, Jürgen König
DOI 10.1103/PhysRevB.85.094518 · Physical Review B
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Abstract
We present a theory of nonequilibrium superconducting proximity effect in an interacting quantum dot induced by a time-dependent tunnel coupling between the dot and a superconducting lead. The proximity effect, which is established when the driving frequency fulfills a gate-voltage-dependent resonance condition, can be probed through the tunneling current into a weakly coupled normal lead. Furthermore, we propose to generate and manipulate coherent superpositions of quantum-dot states with electron numbers differing by two by applying pulsed oscillatory variations to the couplings between the dot and superconductors.
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