Periodically Rocked Thermal Ratchets

Periodically Rocked Thermal Ratchets
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DOI:
10.1209/0295-5075/28/7/001
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发表时间:
1994-12
期刊:
EPL
影响因子:
1.8
通讯作者:
R. Bartussek;P. Hänggi;J. Kissner
R. Bartussek;P. Hänggi;J. Kissner
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
R. Bartussek;P. Hänggi;J. Kissner

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我们考虑过阻尼布朗粒子的各向异性,周期性结构(棘轮),周期性地摇摆。与周期性强迫一起,白色热噪声可以产生非零的宏观速度。通过调整参数,电流的方向可以反转。此外,作为驱动幅度的函数的电流在有限的驱动频率下表现出几个局部最大值。对于零热噪声,确定性电流假设一个有趣的结构,反映了粒子沿沿着漂移的复杂动力学。
We consider overdamped Brownian particles in anisotropic, periodic structures (ratchets) that are rocked periodically. Together with the periodic forcing, white thermal noise can generate a non-zero, macroscopic velocity. By tuning the parameters, the direction of the current can be reversed. Additionally, the current as a function of the driving amplitude exhibits several local maxima at finite driving frequencies. For zero thermal noise, the deterministic current assumes an intriguing structure, reflecting the complex dynamics of particle excursions along the ratchet.