Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 49: Superconductivity: Superconducting Electronics I
TT 49.7: Talk
Wednesday, March 14, 2018, 11:30–11:45, H 2053
Improved quasiparticle thermalization for hybrid single-electron turnstiles — •Joonas Peltonen1, Dmitry Golubev1, Antti Moisio1, Ville Maisi1, Matthias Meschke1, Jaw-Shen Tsai2,3, and Jukka Pekola1 — 1Department of Applied Physics, Aalto University School of Science, Espoo, Finland — 2RIKEN Center for Emergent Matter Science, Wako, Saitama, Japan — 3Department of Physics, Tokyo University of Science, Kagurazaka, Tokyo, Japan
To advance towards metrologically useful current quantization accuracy in a turnstile based on a single-electron transistor with superconducting aluminium electrodes and a normal metallic island, low density of both residual and drive-induced quasiparticles in the superconducting leads is required. We present measurement results from devices where the thickness of the Al electrodes has been increased by an order of magnitude compared to the maximum allowed by the conventional fabrication process [1]. We further discuss recent experiments where the quasiparticle density at the turnstile junctions is actively lowered by running a current through a nearby voltage-biased tunnel junction between two superconductors with differing energy gaps.
J. T. Peltonen, A. Moisio, V. F. Maisi, M. Meschke, J. S. Tsai, and J. P. Pekola, 1709.09832 (2017).