Discrete soliton ratchets driven by biharmonic fields
- Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine, Kyiv 03143 (Ukraine)
- Dipartamento di Fisica 'E. R. Caianiello' and Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), Universita di Salerno, I-84081 Baronissi, Salerno (Italy)
Directed motion of topological solitons (kinks or antikinks) in the damped and ac-driven discrete sine-Gordon system is investigated. We show that if the driving field breaks certain time-space symmetries, the soliton can perform unidirectional motion. The phenomenon resembles the well known effects of ratchet transport and nonlinear harmonic mixing. Direction of the motion and its velocity depends on the shape of the ac drive. Necessary conditions for the occurrence of the effect are formulated. In comparison with the previously studied continuum case, the discrete case shows a number of new features: nonzero depinning threshold for the driving amplitude, locking to the rational fractions of the driving frequency, and diffusive ratchet motion in the case of weak intersite coupling.
- OSTI ID:
- 21069808
- Journal Information:
- Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, Vol. 73, Issue 6; Other Information: DOI: 10.1103/PhysRevE.73.066621; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-651X
- Country of Publication:
- United States
- Language:
- English
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