Europhys. Lett.
Volume 68, Number 6, December 2004
Page(s) 783 - 789
Section General
Published online 26 November 2004
Europhys. Lett., 68 (6), pp. 783-789 (2004)
DOI: 10.1209/epl/i2004-10287-1

Asymmetric confinement in a noisy bistable device

M. Borromeo1 and F. Marchesoni2

1  Dipartimento di Fisica and Istituto Nazionale di Fisica Nucleare Università di Perugia - I-06123 Perugia, Italy
2  Dipartimento di Fisica, Università di Camerino - I-62032 Camerino, Italy

received 2 September 2004; accepted 22 October 2004
published online 26 November 2004

A Brownian particle hopping in a symmetric double-well potential can be statistically confined to a single well by the simultaneous action of a) two periodic input signals, one tilting the minima, the other one modulating the barrier height; b) an additive and a purely multiplicative random signal, generated by a unique source and thus preserving a certain degree of statistical correlation. In view of technological implementation, such a basic mechanism for asymmetric confinement can be conveniently maximized by tuning the input signal parameters (correlation time, phase/time lag, amplitudes), thus revealing a resonant localization mechanism of wide applicability.

05.40.-a - Fluctuation phenomena, random processes, noise, and Brownian motion.
02.50.Ey - Stochastic processes.
82.20.-w - Chemical kinetics and dynamics.

© EDP Sciences 2004