Schmitt, R. K.Rodríguez Parrondo, Juan ManuelLinke, H.Johansson, J.2023-06-182023-06-182015-06-151367-263010.1088/1367-2630/17/6/065011https://hdl.handle.net/20.500.14352/24182©2015 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. The research leading to these results has received funding from the European Union Seventh Framework program (FP7/2007-2013) under grant agreement nr 308850 (project acronym INFERNOS) and by the Swedish Research Council. J M R P gratefully acknowledges the Pufendorf Institute at Lund university for its hospitality at the beginning of this project and financial support from the Spanish MINECO Grant ENFASIS (FIS2011-22644).We present a model for a feedback-controlled ratchet consisting of a Brownian particle and a moving, finite barrier that is shifted by an external agent depending on the position of the particle. By modifying the value of a single parameter of the feedback protocol, the model can act either as a pure rectifier, a power-stroke (PS) motor, or a combination of both. Interestingly, in certain situations the motor reaches a maximum efficiency for an intermediate value of that parameter, i.e., for a combination of the information ratchet and the PS mechanisms. We relate our results to the biological motors kinesin, myosin II, and myosin V, finding that these motors operate in a regime of length scales and forces where the efficiency is maximized for a combination of rectification and PS mechanisms.engAtribución 3.0 Españahttps://creativecommons.org/licenses/by/3.0/es/journal articlehttp://dx.doi.org/10.1088/1367-2630/17/6/065011http://iopscience.iop.org/open access539.12nd LawMaxwells demonJarzynski equalityMutual informationSymmetry-breakingEquilibriumEnergeticsPrincipleFeedbackEntropy.Física nuclear2207 Física Atómica y Nuclear