Supersymmetric ratchets.
The overdamped Brownian motion in a periodic potential under far from equilibrium conditions is considered. A large class of systems with an intrinsic asymmetry, called supersymmetric ratchets, is identified for which the occurrence of directed transport can be ruled out without any fine-tuning of parameters.
Reimann
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Institut für Physik, Universität Augsburg, Universitätsstrasse 1, D-86135 Augsburg, Germany.