Entropic stochastic resonance without external force in oscillatory confined space.

摘要: We have studied the dynamics of Brownian particles in a confined geometry dumbbell-shape with periodically oscillating walls. Entropic stochastic resonance (ESR) behavior, characterizing by maximum value coherent factor Q at some optimal level noise, is observed even without external periodic force horizontal direction, which necessary for conventional ESR where wall static and particle subjected to force. Interestingly, can be remarkably enhanced gravity G, contrast case. In addition, decreases (increases) G small (large) noise limit, respectively, while it non-monotonically changes moderate levels. applied an effective 1D coarsening description illustrate such nontrivial dependence on investigating property potential entropic nature paying special attention excess part resulting from boundary oscillation. Dependences strength other related parameters are also discussed.