Portal de Periódicos da CAPES

Internal Mode Mechanism for Collective Energy Transport in Extended Systems

2003; American Physical Society; Volume: 91; Issue: 23 Linguagem: Inglês

10.1103/physrevlett.91.234102

1092-0145

L. Morales-Molina, Niurka R. Quintero, Franz G. Mertens, Ángel Sánchez,

Advanced Thermodynamics and Statistical Mechanics

We 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 explains 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.