Stochastic resonance in soft matter systems: combined effects of static and dynamic disorder
Stochastic resonance in soft matter systems: combined effects of static and dynamic disorder
复制标题
DOI：
10.1039/b804566f
复制
发表时间：
2008-01-01
期刊：
影响因子：
3.4
通讯作者：
Kralj, Samo
中科院分区：
文献类型：
--
作者：
Perc, Matjaz;Gosak, Marko;Kralj, Samo
研究了具有代表性的软物质系统中静、动态失序对随机共振现象的影响。由于它们对弱扰动的极端敏感性，软物质系统似乎是观测SR的优秀候选者。事实上，我们从聚合物稳定铁电液晶（LC）电池中推导出一般SR方程，这是一个典型的软物质代表，构成了几个电光应用的基本组件之一。我们进一步推广这些方程，以便研究更广泛的定性不同系统，特别是揭示LC分子之间不同类型的静态无序和相互作用范围对SR响应的影响。我们确定了在所研究的系统中观察SR的必要条件，并且揭示了随机场型静态失序在随机稀释、随机键和自旋玻璃普适性类别方面产生质的不同响应。特别是，后三种方法降低了保证最佳响应的动态无序（高斯噪声）水平，而前一种方法则产生了完全相反的效果，从而增加了根据弱确定性电场共振微调系统响应所需的最佳噪声水平。这些观察结果与系统大小和相互作用的范围无关，因此意味着它们的一般有效性和潜在的广泛适用性也适用于其他类似的设置。我们认为，软物质系统可能特别适合作为不同的基于sr的敏感探测器的基础，因此在目前概述的方向上进行额外的理论和实验研究的有力候选者。
We study the impact of static and dynamic disorder on the phenomenon of stochastic resonance (SR) in a representative soft matter system. Due to their extreme susceptibility to weak perturbations, soft matter systems appear to be excellent candidates for the observation of SR. Indeed, we derive generic SR equations from a polymer-stabilized ferroelectric liquid crystal (LC) cell, which is a typical soft matter representative constituting one of the basic components in several electro-optic applications. We generalize these equations further in order to study an even broader class of qualitatively different systems, especially disclosing the influence of different types of static disorder and interaction ranges amongst LC molecules on the SR response. We determine the required conditions for the observation of SR in the examined system, and moreover, reveal that a random field type static disorder yields qualitatively different responses with respect to random dilution, random bond and spin glass universality classes. In particular, while the latter three decrease the level of dynamic disorder ( Gaussian noise) warranting the optimal response, the former evokes exactly the opposite effect, hence increasing the optimal noise level that is needed to resonantly fine-tune the system's response in accordance with the weak deterministic electric field. These observations are shown to be independent of the system size and range of interactions, thus implying their general validity and potentially wide applicability also within other similar settings. We argue that soft matter systems might be particularly adequate as a base for different SR-based sensitive detectors and thus potent candidates for additional theoretical as well as experimental research in the presently outlined direction.