On the transient Fluctuation Dissipation Theorem after a quench at a critical point

On the transient Fluctuation Dissipation Theorem after a quench at a critical point

The Modified Fluctuation Dissipation Theorem (MFDT) proposed by G. Verley et al. {\it (EPL 93, 10002, (2011))} for non equilibrium transient states is experimentally studied. We apply MFDT to the transient relaxation dynamics of the director of a liquid crystal after a quench close to the critical p...

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Veröffentlicht in:arXiv.org 2015-06
Hauptverfasser: Theurkauff, Isaac, Caussarieu, Aude, Petrosyan, Artyom, Ciliberto, Sergio
Format: Artikel
Sprache:eng
Schlagworte:
Aging (materials)
Critical point
Electric fields
Freedericksz transitions
Liquid crystals
Phase transitions
Physics - Statistical Mechanics
Theorems
Variation
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Caussarieu, Aude
Petrosyan, Artyom
Ciliberto, Sergio
description The Modified Fluctuation Dissipation Theorem (MFDT) proposed by G. Verley et al. {\it (EPL 93, 10002, (2011))} for non equilibrium transient states is experimentally studied. We apply MFDT to the transient relaxation dynamics of the director of a liquid crystal after a quench close to the critical point of the Fréedericksz transition (Ftr), which has several properties of a second order phase transition driven by an electric field. Although the standard Fluctuation Dissipation Theorem (FDT) is not satisfied, because the system is strongly out of equilibrium, the MFDT is perfectly verified during the transient in a system which is only partially described by Landau-Ginzburg (LG) equation, to which our observation are compared. The results can be useful in the study of material aging.
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subjects Aging (materials)
Critical point
Electric fields
Freedericksz transitions
Liquid crystals
Phase transitions
Physics - Statistical Mechanics
Theorems
Variation
title On the transient Fluctuation Dissipation Theorem after a quench at a critical point
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