Abstract
We compare vibrational dynamics in two structurally distinct, simple monatomic model glasses simulated by molecular dynamics: the Lennard-Jones glass with an fcc-related structure and a glass with predominantly icosahedral short-range order. The former, characterized by a single local quasiperiodicity, supports only modes with acoustic behavior. In the latter, the presence of optic modes and two incommensurate length scales is observed. This pattern of vibrational dynamics is shown to be closely related to that of a Frank-Kasper crystal having the same local topological order.
- Received 28 November 2000
DOI:https://doi.org/10.1103/PhysRevB.63.184301
©2001 American Physical Society