2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/26596We 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 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, sub-harmonic dynamics and voltage reversal due to the inertial mass of a fluxon.accepted by PRL. To see status click on http://134.2.74.170:88/cnt/cond-mat_0506754.htmlSuperconductivityPattern Formation and Solitonstext