Kondo resonance in a nanotube quantum dot coupled to a normal and a superconducting lead
M. R. Graeber, T. Nussbaumer, W. Belzig, T. Kontos, C. Schoenenberger
Abstract
We report on electrical transport measurements through a carbon nanotube quantum dot coupled to a normal and a superconducting lead. The ratio of Kondo temperature and superconducting gap TK/Δ is identified to govern the transport properties of the system. In the case of TK<Δ the conductance resonance splits into two resonances at Δ. For the opposite scenario TK>Δ the conductance resonance persists, however the conductance is not enhanced compared to the normal state due to a relative asymmetry of the lead-dot couplings. Within this limit the data is in agreement with a simple model of a resonant SN-interface.
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