Ab initiosimulation of pressure-induced low-energy excitations in amorphous silicon

Murat Durandurdu, D. A. Drabold
2002 Physical Review B (Condensed Matter)  
We study the pressure dependence of vibrational spectrum of amorphous silicon using an ab initio constant pressure relaxation simulation. With the application of pressure the low-energy modes soften and their acousticlike character decreases. On the other hand, high-frequency modes shift toward the higher energies, and the localized spectral tail modes become extended under pressure.
doi:10.1103/physrevb.66.155205 fatcat:4e5rocty6fc2lpuu643ixwnx4e