Figure 9. Vibrational density of states and vibrational amplitudes in superlattice S3.

We report data corresponding to the indicated values of the the interfacial interaction energy ε_AB and the repetition period W: (a) ε_AB = 0.5, W = 4, (b) ε_AB = 0.5, W = 20, and (c) ε_AB = 0.1, W = 20. In panels at the top, we show the vDOS g(ω) for the superlattices of type S3, together with those of the corresponding one-component homogeneous crystal and glass with unmodified interactions. In panels at the bottom we show the vibrational amplitudes, and , in layers A and B, plotted as functions of the eigenfrequency ω^k. The solid line represents the average values and , calculated in bins of the form ω^k ± δω^k/2, with δω^k = 0.5. The horizontal dotted lines indicate .