Volume 67, Number 2, July 2004
|Page(s)||158 - 164|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 July 2004|
Stochastic resonance in colloidal systems
2. Physikalisches Institut, Universität Stuttgart Pfaffenwaldring 57, 70550 Stuttgart, Germany
2 Faculty of Mathematics and Physics, University of Ljubljana Jadranska 19, 1000 Ljubljana, Slovenia
Accepted: 5 May 2004
We investigate the dynamical properties of a colloidal particle in a double-well potential which is periodically modulated in time. In case of the modulation corresponding to a tilt of the potential (asymmetric modulation), stochastic resonance is observed when the modulation frequency matches one half of the Kramers frequency of the unperturbed potential. In contrast, when only the potential barrier height is modulated (symmetric modulation), no synchronization between the modulation and the particle dynamics is observed as demonstrated by the lack of a peak in the power spectrum at .
PACS: 02.50.Ey – Stochastic processes / 05.40.Jc – Brownian motion / 82.70.Dd – Colloids
© EDP Sciences, 2004
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