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 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.

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References in corpus (9)

• Brownian motors
• Ratchet-like dynamics of fluxons in annular Josephson junctions driven by bi-harmonic microwave fields
• Quantum ratchet effect for vortices
• Broken symmetries and directed collective energy transport
• Soliton ratchets
• Deterministic ratchets: route to diffusive transport
• Creation of classical and quantum fluxons by a current dipole in a long Josephson junction
• Multi-band quantum ratchets
• Experimental realization of a relativistic fluxon ratchet

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