Characterization of the vortex-pair interaction law and nonlinear mobility effects

Characterization of the vortex-pair interaction law and nonlinear mobility effects

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Employing nematic liquid crystals in a homeotropic men firefighter costume cell with a photosensitive wall, dissipative vortex pairs are selectively induced by external illumination and the interaction law is characterized for pairs of opposite topological charges.Contrary to the phenomenological fit with a force inversely proportional to the distance, the data provide evidence that nonlinear mobility effects m1917a1 kelly helmet must be taken into account.The observations lead to a reconciliation of experiments with theory.