Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Transport: Quantum Dots, Wires, Point Contacts 2 (jointly with HL)

TT 16.4: Vortrag

Montag, 11. März 2013, 15:45–16:00, H18

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

We present in this study a transport theory for a carbon nanotube quantum dot coupled to superconducting leads to lowest order in the tunneling. A generalized master equation is used to model the dynamics. For high enough temperatures, quasiparticles in the superconducting lead get thermally excited across the gap, leading to conductance in the Coulomb blockade including the subgap region. Around zero bias conductance peaks are observed. A comparison of the temperature dependence of these thermally induced conductance peaks with experimental data shows excellent agreement.