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Computer simulation of ferroelastic materials reveals dynamic polar vortex structures related to flexo-electricity between cation and anion lattices. At finite temperatures the vortices are found to flicker in time and space. Widely spaced ferroelastic twin boundaries nucleate vortices while dense twin boundaries suppress them. The time averaged number of vortices at any site decays exponentially indicating the highly mobile dynamics of the vortex lattice. Applied electric fields break thedoi:10.1063/1.4896143 fatcat:tea7xfy2nzdwxbnyjy7yorg75q