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We show, using molecular dynamics simulations, that a two-dimensionalLennard-Jones solid is subject to droplet fluctuations characterized by {\emnon-affine} deviations from local crystallinity. The fraction of particles inthese droplets increases as the mean density of the solid decreases andapproaches $\approx 20$% of the total number in the vicinity of the fluid-solidphase boundary. We monitor the geometry, local equation of state, densitycorrelations and van Hove functions of these droplets and show that some ofthese droplets are fluid-like and compact, while some are glassy andstring-like. We provide evidence that these non-affine heterogeneities shouldbe interpreted as being droplet fluctuations from nearby, metastable minima.

Non-affine heterogeneities and droplet fluctuations in an equilibrium crystalline solid