Open AccessStochastic resonance in colloidal systems
Author(s) -
Dušan Babić,
Carmen Schmitt,
I. Poberaj,
Clemens Bechinger
Publication year - 2004
Publication title -
epl (europhysics letters)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.625
H-Index - 165
eISSN - 1286-4854
pISSN - 0295-5075
DOI - 10.1209/epl/i2004-10055-3
Subject(s) - stochastic resonance , modulation (music) , resonance (particle physics) , physics , frequency modulation , particle (ecology) , synchronization (alternating current) , tilt (camera) , spectral density , colloidal particle , dynamics (music) , contrast (vision) , statistical physics , optics , colloid , mathematics , atomic physics , chemistry , noise (video) , acoustics , computer science , topology (electrical circuits) , biology , telecommunications , artificial intelligence , image (mathematics) , bandwidth (computing) , geometry , combinatorics , ecology , statistics
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 νΩ 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 νΩ.
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