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

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

2006-12-17

arxiv.org/abs/cond-mat/0612440v1

Phys. Rev. B 76, 104514 (2007).

Physics

Condensed Matter

Superconductivity

7 pages, 9 figures

Scientific paper

10.1103/PhysRevB.76.104514

We analyze the charge transport through a single level quantum dot coupled to a normal (N) and superconducting (S) leads where the electron pairs exist either as the coherent (for temperatures below T_c) or incoherent objects (in a region T_c < T < T*). This situation can be achieved in practice if one uses the high T_c superconducting material where various precursor effects have been observed upon approaching $T_{c}$ from above. Without restricting to any particular microscopic mechanism we investigate some qualitative changes of the nonequilibrium charge current caused by the electron pair coherence.

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