Morales-Molina, LuisQuintero, Niurka R.Mertens, Franz G.2012-08-292012-08-292003-12-05Physical Review Letters, vol. 91, n. 23, 5 dec. 2003. Pp. 1-40031-9007 (print version)1079-7114 (online version)https://hdl.handle.net/10016/15144We study directed energy transport in homogeneous nonlinear extended systems in the presence of homogeneous ac forces and dissipation. We show that the mechanism responsible for unidirectional motion of topological excitations is the coupling of their internal and translation degrees of freedom. Our results lead to a selection rule for the existence of such motion based on resonances that explain earlier symmetry analysis of this phenomenon. The direction of motion is found to depend both on the initial and the relative phases of the two harmonic drivings, even in the presence of noise.application/pdfengresearch articleMatemáticas10.1103/PhysRevLett.91.234102open access