Fig. 2
From: Nanocrystal superlattices as phonon-engineered solids and acoustic metamaterials
Modeling the Superlattice Phonon Density of States a The total energy E of an HDT ligand plotted versus the stretch of the ligand, x, shows the characteristic parabolic dependence of a spring. b Computed effective spring constants of dithiol ligands. c Illustration of PbS NC-solids depicting a [100] cross-section through a FCC superlattice. d The expected gSL(ω) for an FCC lattice with no disorder (bottom line), and with increasing disorder in the NC masses (σm = 10, 20, 50, 100, 200%), and a uniform distribution of spring constants, k ∈ (0.5, 1.5) N/m, i.e., β = 1
