Dresden 2009 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 22: Brownian motion and transport II
DY 22.1: Vortrag
Donnerstag, 26. März 2009, 10:15–10:30, ZEU 118
Uphill motion in a deterministic relativistic Josephson Vortex Ratchet — •Edward Goldobin1, Martin Knufinke1, Kai Buckenmaier1, Michael Siegel2, Dieter Koelle1, and Reinhold Kleiner1 — 1Physikalisches Institut and Center for Collective Quantum Phenomena, University of Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany — 2Institut für Mikro- und Nanoelektronische Systeme, Universität Karlsruhe (KIT), Hertzstr. 16, D-76187 Karlsruhe, Germany
We investigate experimentally a deterministic relativistic Josephson vortex ratchet (JVR), i.e., a fluxon moving in a spatially asymmetric potential along annular long Josephson junction. The fluxon is driven by deterministic ac force with zero time average[1,2,3,4]. The rectification of an applied ac drive to a dc voltage (unidirectional fluxon motion) in such a system was demonstrated earlier in both quasi-static and non-adiabatic regimes[2,4]. Still the ratchet was not loaded. Now, being in the rectification regime, we apply an additional bias current which tilts the potential so that the fluxon moves uphill due to the ratchet effect. At some value Istop of the bias current the fluxon stops. We determine Istop both experimentally and numerically in a quasi-static and in a non-adiabatic regime and show the regions that are most favorable for operation of a JVR.
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M. Beck et al., Phys. Rev. Lett. 95, 090603 (2005).