Shape fluctuation-induced dynamic hysteresis.
Shape fluctuation-induced dynamic hysteresis.
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DOI：
10.1063/1.3693333
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发表时间：
2012-03
期刊：
影响因子：
--
通讯作者：
M. Das;D. Mondal;D. Ray
中科院分区：
文献类型：
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作者：
M. Das;D. Mondal;D. Ray
我们考虑一个被限制在二维双叶外壳中的布朗粒子系统，其壁由外部扰动在时间上周期性地驱动。形状调制下粒子的响应的特征在于弛豫延迟，其导致响应函数场环路的非消失区域，响应函数是粒子驻留在任何波瓣中的积分概率。这种现象是动态滞后的熵类似物，在准静态极限下消失。磁滞回线面积取决于温度、调制场强度和外壳的几何参数，并表现出作为场频率函数的周转率。
We consider a system of Brownian particles confined in a two-dimensional bilobal enclosure whose walls are driven in time periodically by an external perturbation. The response of the particles under shape modulation is characterized by a relaxational delay which results in a non-vanishing area of the response function-field loop, response function being the integrated probability of residence of the particles in any of the lobes. This phenomenon is an entropic analogue of dynamical hysteresis, which vanishes in the quasi-static limit. The hysteresis loop area depends on temperature, strength of modulating field, and the geometrical parameters of the enclosure and exhibits a turnover as a function of frequency of the field.