Nonlinear Sciences – Chaotic Dynamics
Scientific paper
2010-06-02
Nonlinear Sciences
Chaotic Dynamics
5 pages, 4 figures
Scientific paper
Conclusive mathematical arguments are presented supporting the ratchet conjecture [R. Chac\'{o}n, J. Phys. A \textbf{40}, F413 (2007)], i.e., the existence of a universal force waveform which optimally enhances directed transport by symmetry breaking. Specifically, such a particular waveform is shown to be \textit{unique} for both temporal and spatial biharmonic forces, and general (\textit{non}-perturbative) laws providing the dependence of the strength of directed transport on the force parameters are deduced for these forces. The theory explains previous results for a great diversity of systems subjected to such biharmonic forces and provides a universal quantitative criterion to optimize \textit{any} application of the ratchet effect induced by symmetry breaking of temporal and spatial biharmonic forces.
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