Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 21: Transport: Quantum dots, wires, point contacts 2 (TT, jointly with HL)

HL 21.3: Talk

Monday, March 11, 2013, 15:30–15:45, H18

Thermal quasiparticle spectroscopy of a carbon nanotube quantum dot coupled to superconducting leads: part I, experiment — •Markus Gaaß, Andreas K. Hüttel, Tom Geiger, Sebastian Pfaller, Andrea Donarini, Milena Grifoni, and Christoph Strunk — University of Regensburg, 93040 Regensburg, Germany

We present electronic transport measurements of a single wall carbon nanotube quantum dot contacted with Niobium electrodes. At elevated temperatures, within the superconductor energy gap and the Coulomb blockade region additional transport resonances arise, which we attribute to thermally generated quasiparticles in the Nb leads. A detailed comparison of the temperature dependence with model calculations leads to excellent agreement for zero as well as finite applied bias.