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

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Ratz, Sascha ; Donarini, Andrea ; Steininger, Daniel ; Geiger, Thomas ; Kumar, Amit ; Hüttel, Andreas K. ; Strunk, Christoph ; Grifoni, Milena
Date of publication of this fulltext: 09 Mar 2015 07:21


We report on the 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 ...


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