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Fractional Brownian motion of director fluctuations in nematic ordering

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Temporal director fluctuations in nematic ordering were studied by computer simulation on the Lebwohl-Lasher model as well as by neutron-scattering experiments on the nematogen d-PAA. The time-series data have been analyzed by the rescaled-range method and in terms of the power spectrum in order to determine the Hurst exponent H. Theory and experiment are in good agreement. A value of H1 was found for the nematic phase, characterizing fractional Brownian motion, whereas H0.5, reflecting ordinary Brownian motion, applies in the isotropic phase. Field-induced crossover from fractional to ordinary Brownian motion was observed in the nematic phase.

OriginalsprogEngelsk
TidsskriftPhysical Review Letters
Vol/bind70
Udgave nummer12
Sider (fra-til)1834-1837
Antal sider4
ISSN0031-9007
DOI
StatusUdgivet - 1993
Eksternt udgivetJa

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