Internal mode mechanism for collective energy transport in extended systems

Details Internal mode mechanism for collective energy transport in extended systems Internal mode mechanism for collective energy transport in extended systems

2003-05-09

arxiv.org/abs/cond-mat/0305207v3

Physics

Condensed Matter

Statistical Mechanics

Final version, to appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.91.234102

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.

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