title: High-efficiency deterministic Josephson vortex ratchet.
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.
authors.affiliation: Physikalisches Institut-Experimentalphysik II, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Beck
authors.forename: E
authors.initials: E
authors.lastname: Goldobin
authors.forename: M
authors.initials: M
authors.lastname: Neuhaus
authors.forename: M
authors.initials: M
authors.lastname: Siegel
authors.forename: R
authors.initials: R
authors.lastname: Kleiner
authors.forename: D
authors.initials: D
authors.lastname: Koelle