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Impurity-induced defects play a crucial role for the properties of crystals,but little is known about impurities with anisotropic shape. Here, we study howcolloidal dumbbells distort and interact with a hexagonal crystal of chargedcolloidal spheres at a fluid interface. We find that subtle changes in thedumbbell length induce a transition from a local distortion to a particle-bounddislocation, and determine how the dumbbell moves inside the repulsivehexagonal lattice. Our results provide new routes towards controlling materialproperties through particle-bound dislocations.

Dumbbell impurities in 2D crystals of repulsive colloidal spheres induce particle-bound dislocations