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We investigate ground state configurations of atomic systems in twodimensions interacting via short range pair potentials. As the number ofparticles tends to infinity, we show that low-energy configurations converge toa macroscopic cluster of finite surface area and constant density, the latterbeing given by the density of atoms per unit volume in the triangular lattice.In the special case of the Heitmann-Radin sticky disc potential and exactground states, we show that the macroscopic cluster has a (unique) Wulff shape.This is done by showing that the atomistic energy, after subtracting off a bulkpart and re-scaling, Gamma-converges to a macroscopic anisotropic surfaceenergy.

Minimizing atomic configurations of short range pair potentials in two dimensions: crystallization in the Wulff shape