Conductance properties of nanotubes coupled to superconducting leads: signatures of Andreev states dynamics

We present a combined experimental and theoretical analysis of the low bias conductance properties of carbon nanotubes coupled to superconducting leads. In the Kondo regime, the conductance exhibits a zero bias peak which can be several times larger than the unitary limit in the normal case. This ze...

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Bibliographic Details
Published in:Solid state communications 2004-09, Vol.131 (9), p.625-630
Main Authors: Vecino, E., Buitelaar, M.R., Martı́n-Rodero, A., Schönenberger, C., Levy Yeyati, A.
Format: Article
Language:English
Subjects:
A. Nanotubes
A. Quantum dots
D. Kondo effect
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Summary:We present a combined experimental and theoretical analysis of the low bias conductance properties of carbon nanotubes coupled to superconducting leads. In the Kondo regime, the conductance exhibits a zero bias peak which can be several times larger than the unitary limit in the normal case. This zero bias peak can be understood by analyzing the dynamics of the subgap Andreev states under an applied bias voltage. It is shown that the existence of a linear regime is linked to the presence of a finite relaxation rate within the system. The theory provides a good fitting of the experimental results.
ISSN:0038-1098
1879-2766
DOI:10.1016/j.ssc.2004.05.031