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Temperature dependence of Andreev spectra in a superconducting carbon nanotube quantum dot

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arxiv 1308.1020 v3 pith:QSWVVING submitted 2013-08-05 cond-mat.mes-hall

A. Kumar , M. Gaim , D. Steininger , A. Levy Yeyati , A. Martin-Rodero , A. K. Huettel , C. Strunk This is my paper
classification cond-mat.mes-hall
keywords superconductingandreevcarbonmodelnanotubequantumabs-dispersionanderson
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Tunneling spectroscopy of a Nb coupled carbon nanotube quantum dot reveals the formation of pairs of Andreev bound states (ABS) within the superconducting gap. A weak replica of the lower ABS is found, which is generated by quasi-particle tunnelling from the ABS to the Al tunnel probe. An inversion of the ABS-dispersion is observed at elevated temperatures, which signals the thermal occupation of the upper ABS. Our experimental findings are well supported by model calculations based on the superconducting Anderson model.

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