Fluctuations near a critical point
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1 Bari 3-5 September 2008 Fluctuations near a critical point S. Ciliberto, S. Joubaud, B. Persier, A. Petrossyan Laboratoire de Physique, ENS de Lyon - UMR5672 CNRS
2 Fluctuations near a critical point Motivations Why is interesting to study these fluctuations near a second order phase transition? 1) The probability density functions of global variables S. T. Bramwell, P. Holdsworth, J.-F. Pinton, Nature vol. 396, 552 (1998) Universality of rare fluctuations in turbulence and critical phenomena E. Bertin, Phys. Rev. Lett, (2005). Global fluctuations in Gumbel Statistics 2) Aging at critical point L. Berthier, P. Holdsworth, Europhys. Lett. 58, 35 (2002) Surfing on a critical line: Rejuvenation without chaos, memory without a hierarchical phase space P. Calabrese and A. Gambassi, cond-mat/ v2 Aging Properties of Critical Systems
3 Outline 1) The Fréedericksz transition in liquid crystals 2) Second order phase transition and the global variable of interest 3) Experimental system 4) Experimental results on PDF 5) The universal PDF for global variables 6) Aging at critical point 7) Experimental results on aging 8) Conclusions
4 Liquid Crystals and Fréedericksz transition (I) E < Ec A liquid crystal consists of elongated molecules E E >Ec L Competition between : Elastic energy Electrostatic energy Surface treatement. Parallel anchored (planar allignement) Control parameter : voltage difference U
5 Liquid Crystals and Fréedericksz transition (II) E < Ec E >Ec E L Control parameter : voltage difference U Surface treatement. Parallel anchored (planar allignement)
6 Liquid Crystals and Fréedericksz transition (III) With boundary conditions
7 Fréedericksz transition
8 Shadowgraph image from Zhou,Ahlers, arxiv: nlin/ v2
9 Fréedericksz transition
10 Experimental set-up
11 Experimental system: polarization interferometer Sensitivity : m/hz 1/2
12 Measure of the dephasing The dephasing between the Ex and Ey is : Interferometer noise :
13 Mean Amplitude of <ζ> ζ>
14 Fluctuation spectra of ζ
15 Relaxation time as a function of ε
16 L=6.7 µm PDF of ζ
17 Low frequency influence
18 Questions What is the interpretation for the PDF of θ 0? Why this behavior has not been observed before?
19 Universality of fluctuation PDF BHP has been observed in the fluctuations of : the injected power in an experiment of turbulence the magnetizaton in a xy model on the height of the Danube river
20 PDF of ζ Cell with L=6.7 µm and
21 PDF of ζ The BHP distributions are observed when the diameter of the probe is smaller then the correlation length The BHP is determined by the very slow motion
22 Aging at critical point (Calabrese, Gambassi) ε t w t t
23 Fluctuation dissipation theorem after a quench Response function The fluctuation dissipation ratio (FDR)
24 Time evolution after a quench in LC
25 Time evolution of ζ
26 Correlations t
27 FDT in the LC experiment: the measure of the response function FDT In equilibrium T=T eff Γ ext
28 FDT in the LC experiment: In equilibrium and FDT
29 FDT in the LC experiment in equilibrium ε 0 =1,039 ε 0 = 0,1985 response function
30 FDT in the LC experiment in equilibrium ε =0, ε 0 =1, 039 at at A = 2,4.10 A = 1, m² m² Do=1.7mm Do=1.3mm
31 Response function during aging t
32 FDT out of equilibrium: fixed tw as a function of t
33 FDT out of equilibrium: fixed t as a function of tw C(t,t*)
34 Time evolution fixed tw as a function of t evolution of Teff fixed t as a function of tw evolution of t*
35 Conclusions Using a liquid crystal driven by an electric field at the Fréedericksz transition we observe that : The probability distribution function of the order parameter fluctuations are well described by a generalized Gumbel, when the size of the measurement region is comparable to the correlation length. After a quench close to the critical point the system presents power law decay. A master curve of the correlation function may be produced by a rescaling which is similar to the one used in aging materials. FDT is strongly violated during the decay.
36 Time evolution in loglog
37 Integrated response function
38 Mean Amplitude of <ζ> as a function of U ζ>
39 Mean Amplitude of <ζ> ζ>
40 Results on correlations t=0.9s t=0.3s
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