Berlin 2008 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 4: Brownian motion and transport

DY 4.11: Talk

Monday, February 25, 2008, 16:45–17:00, MA 004

Deterministic Relativistic Josephson vortex ratchet: new results — •Edward Goldobin, Reinhold Kleiner, and Dieter Koelle — Physikalisches Institut – Experimentalphysik II and Center for Collective Quantum Phenomena, University of Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany

We investigate a deterministic relativistic Josephson vortex ratchet[1,2] — a fluxon in an asymmetric periodic potential driven by a deterministic force with zero time average. Our previous experiments[3] showed that such a ratchet exhibits several non-adiabatic effects such as quantized rectification, fractional dynamics, and voltage reversal. We also observed an anomalously high average fluxon velocity which, up to now, could not be explained theoretically.

In this talk we present new results in the non-adiabatic regime and also investigate efficiency and loading capability of this kind of deterministic relativistic Josephson vortex ratchet.

[1] E. Goldobin et al. Phys. Rev. E 63, 031111 (2001).
G. Carapella, Phys. Rev. B 63, 54515 (2001).
M. Beck et al., Phys. Rev. Lett. 95, 090603 (2005).