Regensburg 2013 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 29: Transport: Quantum Dots, Wires, Point Contacts 3 (jointly with HL)
TT 29.2: Talk
Tuesday, March 12, 2013, 09:45–10:00, H20
Nonequilibrium effect in a NISIN turnstile — •Andreas Heimes1, Ville Maisi2,3, Jukka Pekola2, Michael Marthaler1, Dmitry Golubev1, and Gerd Schön1 — 1Institut für Theoretische Festkörperphysik, Karlsruher Institut für Technologie, Wolfgang-Gaede-Str. 1, D-76128 Karlsruhe, Germany — 2Low Temperature Laboratory (OVLL), Aalto University School of Science, P.O. Box 13500, 00076 Aalto, Finland — 3Centre for Metrology and Accreditation (MIKES), P.O. Box 9, 02151 Espoo, Finland
A single electron transistor consisting of a superconducting island coupled to two normal leads is investigated. By periodically changing the gate voltage this setup works as a single electron pump. However during the turnstile operation quasiparticles are injected onto the superconductor, which relax via inelastic electron-phonon scattering and effectively heat up the island. We theoretically model the time evolution of the charge transport and the quasiparticle distribution during the pumping process. By analyzing the dependence on pumping frequency we discuss the experimental ability to measure the relaxation dynamics of quasiparticles in the superconducting island.