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

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

2004-06-25

arxiv.org/abs/cond-mat/0406638v1

Proc. XXXIXth Rencontres de Moriond on Quantum Information and Decoherence in Nanosystems, 363 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures. submitted to the Proc. Rencontres de Moriond on Quantum Information and Decoherence in Nanosystems 2004

Scientific paper

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 $T_{K}/\Delta$ is identified to govern the transport properties of the system. In the case of $T_{K}<\Delta$ the conductance resonance splits into two resonances at $\pm \Delta$. For the opposite scenario $T_{K}>\Delta$ 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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