Array-induced collective transport in the Brownian motion of coupled nonlinear oscillator systems

Details Array-induced collective transport in the Brownian motion of coupled nonlinear oscillator systems Array-induced collective transport in the Brownian motion of coupled nonlinear oscillator systems

1998-09-18

arxiv.org/abs/cond-mat/9809247v1

Physics

Condensed Matter

Statistical Mechanics

4 figures, to appear in Phys. Rev. E

Scientific paper

10.1103/PhysRevE.58.7085

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), the 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.

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