_{For more information see Phil Allen's site}

VIBRATIONS IN GLASSES 

With Phil Allen (Stony Brook) and Joe Feldman (NRL) I have studied atomic vibrations in amorphous silicon models. The models, which really are state of the art, are essentially ball-and-stick models, ranging in size from 216 to 4096 atoms. They are created from crystalline silicon models by random bond transpositions (the Wooten, Wiener, Weaire algorithm) and simulated annealing. The models remarkably simulate the structure of real amorphous silicon and the many physical properties we have calculated agree nicely with the existing experimental data. More can be found in the links below.

Character of the atomic vibrations in glasses

Decay of the vibrational states in glasses 

Thermal expansion of amorphous silicon

Sound attenuation in amorphous silicon

Universal spectral statistics of the atomic vibrations in glasses

The image below is a 4096-atom model of amorphous silicon
(created by Brian Davidson then at NRL)