On the transient Fluctuation Dissipation Theorem after a quench at a critical pointReport as inadecuate




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1 ILM - Institut Lumière Matière Villeurbanne 2 Phys-ENS - Laboratoire de Physique de l-ENS Lyon

Abstract : 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 Fr\-eedericksz 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.





Author: Isaac Theurkauff - Aude Caussarieu - Artyom Petrosyan - Sergio Ciliberto -

Source: https://hal.archives-ouvertes.fr/



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