Figure 2
From: Direct observation of melting in a two-dimensional driven granular system
2D structure factors for different packing fractions.
From (a–j), the packing fraction, ϕ is decreasing, with ϕ = 0.856, 0.817, 0.781, 0.755, 0.739, 0.721, 0.716, 0.712, 0.698 and 0.685 respectively. The discrete bright dots in a hexagonal array shows a crystal phase (panels (a,b)) and the bright rings shows a liquid phase (panels (h–j)).
