AC-driven jump distributions on a periodic substrate

[摘要] A driven Brownian particle (e.g. an adatom on a surface) diffusing on a low-viscosity, periodic substrate may execute multiple jumps. In the presence of an additional periodic drive, the jump lengths and time durations become statistically modulated according to a synchronization mechanism reminiscent of asymmetric stochastic resonance. Here, too, bistability plays a key role, but in a dynamical sense, inasmuch as the particle switches between locked and running states. (C) 2000 Elsevier Science B.V. All rights reserved.

[发布日期] 2000-10-20

[关键词] diffusion and migration;equilibrium thermodynamics and statistical mechanics;friction;surface diffusion