Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 20: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 1
TT 20.2: Vortrag
Dienstag, 26. Februar 2008, 14:30–14:45, EB 202
Cooper pair pumping in presence of dissipation — •Valentina Brosco1, Alexander Shnirman1,2, Rosario Fazio3,4, and Gerd Schön1 — 1Institut für Theoretische Festkörperphysik and DFG Center for Functional Nanostructures (CFN), Universität Karlsruhe, Karlsruhe, Germany — 2Institut für Theoretische Physik, Universität Innsbruck, Innsbruck, Austria — 3International School for Advanced Studies (SISSA), Trieste, Italy — 4NEST-CNR-INFM and Scuola Normale Superiore, Pisa, Italy
In a Cooper pair pump charge transport is obtained via an adiabatic and periodic manipulation of Josephson couplings or gate voltages and it is a coherent process. Several works investigated the connection between Cooper pair pumping and the geometric and topological properties of the pumping cycle in the parameters space [1]. Recently the predicted relation between Berry’s phase and pumped charge was demonstrated experimentally [2]. In the present work we analyze the effects of noise on Cooper pair pumping and we show that dissipation may induce a new geometric contribution in the transferred charge. We show that this contribution can be experimentally distinguished both from the usual pumped charge and from the supercurrent contribution and we propose an experiment where the theory can be probed.
[1] M. Aunola and J. J. Toppari, Phys. Rev. B 68, 020502 (2003); V. Brosco, R. Fazio, F. W. J. Hekking, and A. Joye, cond-mat/0702333.
[3] M.Mottonen, J. J. Vartiainen, and J. P. Pekola, cond-mat/0710.5623.