The Vibrational Density of States of Amorphous Semiconductors

摘要: In the classic approach to study of vibrational properties crystalline solids, density states g(ω) is derived (either experimentally or theoretically by a combination two) from dispersion relations ω(k)which give normal mode frequencies as functions Bloch vector k. Take, for example, painstaking work NELIN and NILSSON [2.1], which established rather accurately germanium, shown in Fig.2.1. This involved interpolation, means semi-empirical force constant model, ω(k) data obtained neutron scattering measurements large number k points, integration over Brillouin zone.