title: Rectification in a stochastically driven three-junction SQUID rocking ratchet.
abstract: 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.
authors: Physikalisches Institut and Center for Collective Quantum Phenomena, Universität Tübingen, D-72076 Tübingen, Germany.
authors: A
authors: A
authors: Sterck
authors: D
authors: D
authors: Koelle
authors: R
authors: R
authors: Kleiner
mesh_terms: D008954:Models, Biological; D008962:Models, Theoretical; D020409:Molecular Motor Proteins / Q000737:chemistry; D013269:Stochastic Processes; D013816:Thermodynamics
chemical_list: D020409:Molecular Motor Proteins