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

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

2004-06-10

arxiv.org/abs/cond-mat/0406240v1

Solid State Commun. 131, 625 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 revtex4 pages, 6 figures, to appear in SSC

Scientific paper

10.1016/j.ssc.2004.05.031

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.

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