We study collective dynamics in a chain of harmonically coupled particles subjected to degenerate but asymmetric on-site double-well potentials and driven by white and exponentially correlated noise. The difference of frequencies of small-amplitude oscillations in the vicinity of the wells appears to be a sufficient condition for the existence of the soliton ratchet effect. We find directed thermally activated soliton motion while at certain critical values of either the correlation time or noise strength, a reversal (switching) of the direction of motion takes place. Furthermore, we observe stochastic soliton transport directed against an applied d.c. field.
|Number of pages||6|
|Journal||Physics Letters, Section A: General, Atomic and Solid State Physics|
|Publication status||Published - May 26 1997|
ASJC Scopus subject areas
- Physics and Astronomy(all)