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Design rules for controlling active defects

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Topological defects dictate the properties of many materials, from metal plasticity and magnetic frustration to the resistivity of superconductors. In active fluids, defects can spontaneously propel and drive chaotic flows stirring the fluid. But how can we locally control the dynamics of such defects? I will discuss an additive framework to design elementary activity patterns, as active topological tweezers, to create, move and braid individual defects. A hydrodynamic extension of the framework enables us to control defect organization, patterning and transport at the collective level. I will conclude by highlighting consequences for the design of programmable active and living metafluids.

This talk is part of the DAMTP Statistical Physics and Soft Matter Seminar series.

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