Quantum Dot coupled to a normal and a superconducting lead

M. R. Graeber, T. Nussbaumer, W. Belzig, C. Schoenenberger

Published 2004-03-17Version 1

We report on electrical transport measurements in a carbon nanotube quantum dot coupled to a normal and a superconducting lead. Depending on the ratio of Kondo temperature $T_{K}$ and superconducting gap $\Delta$ the zero bias conductance resonance either is split into two side-peaks or persists. We also compare our data with a simple model of a resonant level - superconductor interface.