Rectification in a stochastically driven three-junction SQUID rocking ratchet.
A three-junction SQUID forms a rocking ratchet for the phase differences across the Josephson junctions. In this Letter we investigate its capability to rectify voltages under stochastic drive currents with a white frequency spectrum up to a cutoff frequency f_{cut}. Experimentally, we accessed the adiabatic regime and find very good agreement with theory. Numerically, we also investigated large values of f_{cut} and find, in agreement with the laws of thermodynamics, that the response disappears, as f_{cut} becomes much larger than the characteristic frequency scales of the system.
Sterck
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A
Physikalisches Institut and Center for Collective Quantum Phenomena, Universität Tübingen, D-72076 Tübingen, Germany.
Koelle
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Kleiner
R
R
D008954:Models, Biological; D008962:Models, Theoretical; D020409:Molecular Motor Proteins / Q000737:chemistry; D013269:Stochastic Processes; D013816:Thermodynamics
D020409:Molecular Motor Proteins