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Updated: Aug 29, 2026

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
Internal mode mechanism for collective energy transport in extended systems
Luis Morales-Molina1, Niurka R Quintero, Franz G Mertens
1Physikalisches Institut, Universität Bayreuth, D-85440 Bayreuth, Germany. Luis.Morales-Molina@uni-bayreuth.de
Abstract:
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 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.
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