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Kondo resonance in a nanotube quantum dot coupled to a normal and a superconducting lead · arXivDesk

cond-mat/0406638Jun 25, 20044 pages, 2 figures. submitted to the Proc. Rencontres de Moriond on Quantum Information and Decoherence in Nanosystems 2004

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

Mesoscale and Nanoscale Physics

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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 $T_{K}/Δ$ is identified to govern the transport properties of the system. In the case of $T_{K}<Δ$ the conductance resonance splits into two resonances at

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\pm Δ

. For the opposite scenario

T_{K}>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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