Superconductivity-enhanced bias spectroscopy in carbon nanotube quantum dots

Details Superconductivity-enhanced bias spectroscopy in carbon nanotube quantum dots Superconductivity-enhanced bias spectroscopy in carbon nanotube quantum dots

2008-09-11

arxiv.org/abs/0809.1944v2

Phys. Rev. B 79, 134518 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.79.134518

We study low-temperature transport through carbon nanotube quantum dots in the Coulomb blockade regime coupled to niobium-based superconducting leads. We observe pronounced conductance peaks at finite source-drain bias, which we ascribe to elastic and inelastic cotunneling processes enhanced by the coherence peaks in the density of states of the superconducting leads. The inelastic cotunneling lines display a marked dependence on the applied gate voltage which we relate to different tunneling-renormalizations of the two subbands in the nanotube. Finally, we discuss the origin of an especially pronounced sub-gap structure observed in every fourth Coulomb diamond.

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