Abstract
We present extensive experimental data on charge transport by Andreev reflection through a mesoscopic superconducting island coupled to two normal metal leads through small tunnel junctions and to a capacitive gate. The data show the systematic dependence on the gate-induced charge of both the Coulomb blockade of Andreev reflection and of striking voltage thresholds that correspond to specific tunneling processes. The magnitude of this Andreev current and its dependence on are in excellent agreement with recent theory, provided that interference between the two tunneling electrons is taken into account.
- Received 29 October 1993
DOI:https://doi.org/10.1103/PhysRevLett.72.1742
©1994 American Physical Society