SCALING BEHAVIOR OF 2-TIME CORRELATIONS IN A TWISTED NEMATIC LIQUID-CRYSTAL

We have measured the coarsening exponent phi and the nontrivial scaling exponent lambda, which characterize how the two-time correlation function C(t,t') scales with the correlation length L(t), C(t,t') is-proportional-to L(t)-lambda when t>>t', for a twisted nematic liquid-crystal system quenched from the isotropic phase to the nematic phase. This system is expected to be Ising-like with phi=0.5 and lambda=1.25. Our values, phi=0.515+/-0.026, measured over two decades in time, and lambda=1.246+/-0.079, measured over the late time period, 30 to 150 s, are in good agreement with theory.