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The dynamics of dislocations confined to grain boundaries in a striped systemare studied using electroconvection in the nematic liquid crystal N4. Inelectroconvection, a striped pattern of convection rolls forms for sufficientlyhigh driving voltages. We consider the case of a rapid change in the voltagethat takes the system from a uniform state to a state consisting of stripeddomains with two different wavevectors. The domains are separated by domainwalls along one axis and a grain boundary of dislocations in the perpendiculardirection. The pattern evolves through dislocation motion parallel to thedomain walls. We report on features of the dislocation dynamics. The kineticsof the domain motion are quantified using three measures: dislocation density,average domain wall length, and the total domain wall length per area. Allthree quantities exhibit behavior consistent with power law evolution in time,with the defect density decaying as $t^{-1/3}$, the average domain wall lengthgrowing as $t^{1/3}$, and the total domain wall length decaying as $t^{-1/5}$.The two different exponents are indicative of the anisotropic growth of domainsin the system.Comment: 8 figures: 7 jpeg and 1 pd

Dislocation dynamics in an anisotropic stripe pattern