Agradecimientos:
Support from a MEC/Fulbright grant, from DGICyT (Spain) under Project No. PB92-0248, and from the European Union Network ERBCHRXCT930413. Work at Zaragoza was supported by DGICyT (Spain) under Project No. PB92-0361, and by the European Union (NETWORK on Nonlinear Approaches to Coherent and Fluctuating Processes in Condensed Matter and Optical Physics). Work at Los Alamos was performed under the auspices of the U.S. Department of Energy.
We study the possibility of kink motion induced by pure ac driving in damped nonlinear lattices, focusing on
the Frenkel-Kontorova and Toda models. Numerical simulations of the Frenkel-Kontorova model show no
evidence for steady kink motion. We point out that We study the possibility of kink motion induced by pure ac driving in damped nonlinear lattices, focusing on
the Frenkel-Kontorova and Toda models. Numerical simulations of the Frenkel-Kontorova model show no
evidence for steady kink motion. We point out that momentum-balance in addition to energy-balance arguments
are needed to understand the translation of the collective excitation. Finally, our result is discussed in
view of related theoretical predictions and numerical simulations.[+][-]
