Bao Jing-Dong, Zhuo Yi-Zhong
Department of Physics, Beijing Normal University, Beijing 100875, China.
Phys Rev Lett. 2003 Sep 26;91(13):138104. doi: 10.1103/PhysRevLett.91.138104.
We present a thermal broadband noise from the difference between two Ornstein-Uhlenbeck noises, which can induce a ballistic diffusion, i.e., long-time mean square displacement of a free particle driven by this noise reads <x(2)(t)> proportional to t(2). We apply this noise to a flashing ratchet and the mean velocity of the particle is calculated via Langevin simulation. The results show that a double peak of the mean velocity and flux reversal appears for the ratchet with large and small asymmetries, respectively; the inertia effect induces a large mean velocity and multireversal of flux. These rich and interesting phenomena are explained.
我们提出了一种由两个奥恩斯坦-乌伦贝克噪声之间的差异产生的热宽带噪声，它可以引发弹道扩散，即受此噪声驱动的自由粒子的长时间均方位移满足<x²(t)>与t²成正比。我们将这种噪声应用于闪烁棘轮，并通过朗之万模拟计算粒子的平均速度。结果表明，对于具有大不对称性和小不对称性的棘轮，分别出现了平均速度的双峰和通量反转；惯性效应导致了较大的平均速度和通量的多次反转。对这些丰富有趣的现象进行了解释。
