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Activated escape of periodically driven systems.

Dykman, M. I. and McCann, L. I. and Smelyanskiy, V. N. and Luchinsky, D. G. and Mannella, R. and McClintock, Peter V. E. (2001) Activated escape of periodically driven systems. Chaos, 11 (3). pp. 587-594. ISSN 1054-1500

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We discuss activated escape from a metastable state of a system driven by a time-periodic force. We show that the escape probabilities can be changed very strongly even by a comparatively weak force. In a broad parameter range, the activation energy of escape depends linearly on the force amplitude. This dependence is described by the logarithmic susceptibility, which is analyzed theoretically and through analog and digital simulations. A closed-form explicit expression for the escape rate of an overdamped Brownian particle is presented and shown to be in quantitative agreement with the simulations. We also describe experiments on a Brownian particle optically trapped in a double-well potential. A suitable periodic modulation of the optical intensity breaks the spatio-temporal symmetry of an otherwise spatially symmetric system. This has allowed us to localize a particle in one of the symmetric wells.

Item Type: Article
Journal or Publication Title: Chaos
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Engineering
Faculty of Science and Technology > Physics
ID Code: 31820
Deposited By: Professor P. V. E. McClintock
Deposited On: 19 Feb 2010 10:51
Refereed?: Yes
Published?: Published
Last Modified: 07 Jan 2015 14:20
Identification Number:

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