Optimal modulation of a Brownian ratchet and enhanced sensitivity to a weak external force.
Optimal modulation of a Brownian ratchet and enhanced sensitivity to a weak external force.
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布朗棘轮的最佳调制和增强对弱外力的敏感性。
DOI：
10.1073/pnas.95.5.2039
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发表时间：
1998
影响因子：
11.1
通讯作者：
Astumian,RD
中科院分区：
文献类型：
--
作者：
Tarlie,MB;Astumian,RD
本文研究了布朗粒子在空间各向异性势中运动的动力学问题，在乘性时间调制的作用下，使V（x，t）=g（t）U（x）.使用的“热力学作用”的概念，我们表明，类的调制，最大限度地提高流量是一个方波的时间。我们还表明，添加一个弱的，均匀的力Fin协同方波调制可以导致粒子的大小略有不同，以相反的方向移动。由F引起的速度的协同变化可能比由Falone引起的漂移速度大得多。
We studied the dynamics of a Brownian particle moving in a spatially anisotropic potential acted on by multiplicative temporal modulations so thatV(x,t) =g(t)U(x). Using the concept of the “thermodynamic action,” we show that the class of modulation that maximizes the flow is a square-wave in time. We also show that adding a weak, homogenous forceFin synergy with the square-wave modulation can cause particles of slightly different size to move in opposite directions. The synergetic change in velocity caused byFcan be much greater than the drift velocity that would be caused byFalone.