Abstract
Extracting energy from Brownian motion by subjecting a fluctuating system to suitably tailored perturbations has been a long-standing subject of investigation, starting from Feynman's ratchet1 to the more recent applications to separation of Brownian particles or optical ratchet effects in cold atom clouds2. A typical approach consists in subjecting a system, in the absence of any externally macroscopic force, to some periodic asymmetric perturbation in order to induce a global drift via the interplay of this perturbation and fluctuations.
© 2007 IEEE
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