Influence of Quantum Fluctuations on Phase Coherent Andreev Tunneling

Details Influence of Quantum Fluctuations on Phase Coherent Andreev Tunneling Influence of Quantum Fluctuations on Phase Coherent Andreev Tunneling

1997-09-30

arxiv.org/abs/cond-mat/9709344v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

RevTeX, 4 pages, 4 eps figures, (tar,gzip,uuencode)

Scientific paper

10.1209/epl/i1998-00131-8

We study the subgap transport properties of a small capacitance normal metal-superconductor tunnel junction coupled to an external electromagnetic environment. Mesoscopic interference between the electrons in the normal metal strongly enhances the subgap conductance with decreasing bias voltage. On the other hand, quantum fluctuations of the environment destroy electronic phase coherence and suppress the subgap conductance at low bias (Coulomb blockade).The competition between charging effects and mesoscopic interference leads to a non-monotonic dependence of the differential subgap conductance on the applied bias voltage. This feature is pronounced, even if the coupling to the environment is weak and the charging energy is small.

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