High-efficiency deterministic Josephson vortex ratchet |
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Authors: | Beck M Goldobin E Neuhaus M Siegel M Kleiner R Koelle D |
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Institution: | Physikalisches Institut-Experimentalphysik II, Universit?t Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany. |
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Abstract: | We investigate experimentally a Josephson vortex ratchet--a fluxon in an asymmetric periodic potential driven by a deterministic force with zero time average. The highly asymmetric periodic potential is created in an underdamped annular long Josephson junction by means of a current injector providing an efficiency of the device up to 91%. We measured the ratchet effect for driving forces with different spectral content. For monochromatic high-frequency drive the rectified voltage becomes quantized. At high driving frequencies we also observe chaos, subharmonic dynamics, and voltage reversal due to the inertial mass of a fluxon. |
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