Stochastic resonance in soft matter systems

combined effects of static and dynamic disorder

Matjaž Perc (Avtor), Marko Gosak (Avtor), Samo Kralj (Avtor)

Povzetek

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.

Ključne besede

dinamični sistemi;stohastični procesi;stohastična resonanca;nelinearni dinamični sistemi;prostorsko-časovni pojavi;statični nered;dinamični nered;dynamic systems;stochastic processes;stochastic resonance;nonlinear dynamical systems;soft-matter systems;static disorder;dynamic disorder;

Podatki

Jezik:	Angleški jezik
Leto izida:	2008
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	IJS - Institut Jožef Stefan
UDK:	519.21:537
COBISS:	16178696
ISSN:	1744-683X
Št. ogledov:	1459
Št. prenosov:	71
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarne ključne besede:	dinamični sistemi;stohastični procesi;stohastična resonanca;nelinearni dinamični sistemi;prostorsko-časovni pojavi;statični nered;dinamični nered;
URN:	URN:SI:UM:
Strani:	str. 1861-1870
Zvezek:	4
Čas izdaje:	2008
DOI:	10.1039/b804566f
ID:	8724038