Brownian motion of an array of harmonically coupled particles subject to a periodic substrate potential, and driven by an external bias, is investigated. In the linear response limit (small bias), coupling between particles may enhance the diffusion process, depending on the competition between the harmonic chain and the substrate potential. An analytical formula of the diffusion rate for the single-particle case is also obtained. In the nonlinear response regime, the moving kink may become phase locked to its radiated phonon waves; hence the mobility of the chain may decrease as one increases the external force.
|Number of pages||6|
|Journal||Physical Review E|
|Publication status||Published - 1 Dec 1998|
Scopus Subject Areas
- Statistical and Nonlinear Physics
- Statistics and Probability
- Condensed Matter Physics