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.
Originalsprog | Engelsk |
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Tidsskrift | Physical Review Letters |
Vol/bind | 70 |
Udgave nummer | 12 |
Sider (fra-til) | 1834-1837 |
Antal sider | 4 |
ISSN | 0031-9007 |
DOI | |
Status | Udgivet - 1993 |
Eksternt udgivet | Ja |
ID: 236890452