Physics – Condensed Matter – Superconductivity
Scientific paper
2005-04-21
Physics
Condensed Matter
Superconductivity
Scientific paper
We propose a phenomenological description of electronic transport through a normal metal/superconductor interface of arbitrary transparency, which accounts for the presence of electron-electron interaction in the normal metal. The effect of interactions is included through an energy-dependent transmission probability that is inserted in the expression for the current-voltage characteristics of a non-interacting system. This results in a crossover from the Andreev to the tunneling limit as a function of the energy at which transport is probed. The proposed description reproduces qualitatively the results obtained with formally correct theories as well as experimental observations. In view of its simplicity, we expect our approach to be of use for the interpretation of future experiments.
Klapwijk Teum M.
Man Hon Tin
Morpurgo Alberto F.
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