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|Title: ||Ratchets in homogeneous extended systems: internal modes and role of noise|
|Author(s): ||Sánchez, Angel|
Mertens, Franz G.
Quintero, Niurka R.
|Publisher: ||World Scientific|
|Issued date: ||Dec-2004|
|Citation: ||Fluctuation and Noise Letters, vol. 4, n. 4, dec. 2004. Pp. L571-L584|
|ISSN: ||0219-4775 (print version)|
1793-6780 (online version)
|Abstract: ||We revisit the issue of directed motion induced by zero average forces in extended systems driven by ac forces. It has been shown recently that a directed energy current appears if the ac external force, f(t), breaks the symmetry f(t) = f(t+T=2), T being the period, if topological solitons (kinks) existed in the system. In this work, a collective coordinate approach allows us to identify the mechanism through which the width oscillation drives the kink and its relation with the mathematical symmetry conditions. Furthermore, our theory predicts, and numerical simulations con rm, that the direction of motion depends on the initial phase of the driving, while the system behaves in a ratchet-like fashion if averaging over initial conditions. Finally, the presence of noise overimposed to the ac driving does not destroy the directed motion; on the contrary, it gives rise to an activation process that increases the velocity of the motion. We conjecture that this could be a signature of resonant phenomena at larger noises.|
|Sponsor: ||AS has been supported by the Ministerio de Ciencia y Tecnología of Spain through grant BFM2003-07749-C05-01. NRQ has been supported by the Ministerio de Ciencia y Tecnología of Spain through grant BFM2001-3878-C02, by the Junta de Andaluc a under project FQM-0207, by DAAD (Germany) A0231253/Ref. 314, and, along with LMM and FGM, by the International Research Training Group `Nonequilibrium Phenomena and Phase Transitions in Complex Systems' (DFG, Germany). KL has been supported by the Engineering Research Program of the Office of Basic Energy Sciences at the U. S. Department of Energy under Grant No. DE-FG03- 86ER13606.|
|Publisher version: ||http://dx.doi.org/10.1142/S0219477504002208|
|Appears in Collections:||DM - GISC - Artículos de Revistas|
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