Radtke Paul K, Schimansky-Geier Lutz
Department of Physics, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany.
Phys Rev E Stat Nonlin Soft Matter Phys. 2012 May;85(5 Pt 1):051110. doi: 10.1103/PhysRevE.85.051110. Epub 2012 May 9.
We investigate the influence of an additional torque on the motion of Brownian particles confined in a channel geometry with varying width. The particles are driven by random fluctuations modeled by an Ornstein-Uhlenbeck process with given correlation time τ_{c}. The latter causes persistent motion and is implemented as (i) thermal noise in equilibrium and (ii) noisy propulsion in nonequilibrium. In the nonthermal process a directed transport emerges; its properties are studied in detail with respect to the correlation time, the torque, and the channel geometry. Eventually, the transport mechanism is traced back to a persistent sliding of particles along the even boundaries in contrast to scattered motion at uneven or rough ones.
我们研究了附加扭矩对限制在宽度变化的通道几何结构中的布朗粒子运动的影响。粒子由具有给定相关时间τ_c的奥恩斯坦-乌伦贝克过程建模的随机涨落驱动。后者导致持续运动，并表现为（i）平衡状态下的热噪声和（ii）非平衡状态下的噪声推进。在非热过程中出现了定向输运；针对相关时间、扭矩和通道几何结构详细研究了其性质。最终，输运机制可追溯到粒子沿平滑边界的持续滑动，这与在不平坦或粗糙边界处的散射运动形成对比。
