Thermally induced subgap features in the cotunneling spectroscopy of a carbon nanotube

Abstract

We report on nonlinear cotunneling spectroscopy of a carbon nanotube quantum dot coupled to Nb superconducting contacts. Our measurements show rich subgap features in the stability diagram which become more pronounced as the temperature is increased. Applying a transport theory based on the Liouville-von Neumann equation for the density matrix, we show that the transport properties can be attributed to processes involving sequential as well as elastic and inelastic cotunneling of quasiparticles thermally excited across the gap. In particular, we predict thermal replicas of the elastic and inelastic cotunneling peaks, in agreement with our experimental results.

arXiv comment21 pages, 9 figures, submitted to New Journal of Physics

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Cited by in corpus (4)

• Enhanced shot noise of multiple Andreev reflections in a carbon nanotube quantum dot in SU(2) and SU(4) Kondo regimes
• Subgap resonant quasiparticle transport in normal-superconductor quantum dot devices
• Liquid-induced damping of mechanical feedback effects in single electron tunneling through a suspended carbon nanotube
• A particle conserving approach to AC-DC driven interacting quantum dots with superconducting leads