Influence of quantum fluctuations on phase-coherent two-electron tunneling
Influence of quantum fluctuations on phase-coherent two-electron tunneling
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 …