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Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity - Poster Session

TT 30.50: Poster

Monday, March 31, 2014, 15:00–19:00, P2

Tunneling and Relaxation of Single Quasiparticles in a Normal-Superconductor-Normal Single Electron Transistor — •Andreas Heimes1, Ville Maisi2,3, Dmitry Golubev2,4, Michael Marthaler1, Gerd Schön1,4, and Jukka Pekola21Institut für Theoretische Festkörperphysik and DFG-Center for Functional Nanostructures, Karlsruhe Institute of Technology, 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 — 4Institute of Nanotechnology, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany

We investigate the properties of a hybrid single electron transistor, involving a small superconducting island sandwiched between normal metal leads, which is driven by dc plus ac voltages and works as a single electron turnstile. During the turnstile operation quasiparticles are injected onto the superconducting island, 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. Our low-temperature results compare well with recent experimental findings obtained for ac-driven hybrid single-electron turnstiles.

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