Influence of pair coherence on charge tunneling through a quantum dot connected to a superconducting lead

T. Domański; A. Donabidowicz; K. I. Wysokiński

doi:10.1103/PhysRevB.76.104514

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Influence of pair coherence on charge tunneling through a quantum dot connected to a superconducting lead

T. Domański, A. Donabidowicz, K. I. Wysokiński

DOI 10.1103/PhysRevB.76.104514 · Physical Review B

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Abstract

We analyze the charge transport through a single level quantum dot coupled to a normal and superconducting lead where the electron pairs exist either as the coherent (for temperatures below Tc) or incoherent objects (in a region Tc<T<T*). Practically, this situation can be encountered using the high Tc superconducting materials where precursor effects have been observed upon approaching Tc from above. Without restricting to any particular microscopic mechanism, we investigate the qualitative properties of nonequilibrium charge current caused by the electron pair coherence.