Regensburg 2010 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 7: Stochastic processes, brownian motion, and transport
DY 7.5: Talk
Tuesday, March 23, 2010, 10:45–11:00, H46
Deterministic Josephson vortex ratchet made of intrinsic junctions — •E. Goldobin1, H. B. Wang2, B. Y. Zhu3, C. Gürlich1, M. Ruoff1, S. Kim2, T. Hatano2, B. R. Zhao3, Z. X. Zhao3, D. Koelle1, and R. Kleiner1 — 1Physikalisches Institut – Experimentalphysik II, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany — 2National Institute for Materials Science, Tsukuba 3050047, Japan — 3National Laboratory for Superconductivity, Institute of Physics, and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
We demonstrate the operation of a deterministic fluxon ratchet made of a stack of 30 intrinsic Josephson junctions strongly coupled with each other. The ratchet has the shape of a gear with 20 asymmetric teeth (periods). It produces a rectified voltage of about 100 µ V at a 12 GHz driving frequency. The effect of coupling between intrinsic junctions, has been studied within the framework of the 2D coupled sine-Gordon equations. We show that this type of device may provide record values of rectified voltage and others figures of merit.