Fig. 5.
Size polydispersity drives the transformation from a square lattice to a hexagonal lattice. (A) The plot of energy vs. Γ. The kink at signifies the transition from the square lattice (Inset; the green horizontal lines are to indicate the regularity of the square lattice) to the hexagonal lattice. The energy is measured in the unit of ϵ defined in the expression for the Hertz potential. (B) The defective hexagonal lattice at
, where the featured screening mode is preserved. The number of particles is
.