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Control of Current Reversal and Separation of Particles in Inertia Ratchets

Published online by Cambridge University Press:  01 February 2011

F. Family ,
H.A. Larrondo  and
C.M. Arizmendi
F. Family
Affiliation:
Department of Physics, Emory University, Atlanta, GA 30322
H.A. Larrondo
Affiliation:
Depto. de Física, Facultad de Ingeniería, Universidad Nacional de Mar del Plata, Av. J.B. Justo 4302, 7600 Mar del Plata, Argentina
C.M. Arizmendi
Affiliation:
Department of Physics, Emory University, Atlanta, GA 30322 Depto. de Física, Facultad de Ingeniería, Universidad Nacional de Mar del Plata, Av. J.B. Justo 4302, 7600 Mar del Plata, Argentina
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Abstract

We have studied the deterministic dynamics of underdamped single and multiparticle ratchets associated with current reversal, as a function of both the amplitude and the frequency of an external driving force. We show that control of current reversals in deterministic inertia ratchets is possible as a consequence of a locking process associated with different mean velocity attractors. Control processes employing small perturbations on the frequency and the amplitude of the external force may be designed in view of the intermixed fractal nature of the domains of attraction of the mean velocity attractors. The range where each control parameter is capable of reversing the current is determined. Quenched noise has significant effect on the basins of attraction. In particular, with increasing disorder the direction of a packet of particles can be reversed, leading to disappearance or weakening of the negative velocity attractor. The influence of the mass of the particles is also considered in order to design control techniques capable of separating particles of different masses.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 790: Symposium P – Dynamics in Small Confining Systems–2003 , 2003 , P5.7
Copyright
Copyright © Materials Research Society 2004

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References

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