Connection between vibrational dynamics and topological order in simple glasses

Details Connection between vibrational dynamics and topological order in simple glasses Connection between vibrational dynamics and topological order in simple glasses

2000-07-24

arxiv.org/abs/cond-mat/0007373v2

Phys. Rev. B, vol. 63, art. No. 184301 (2001)

Physics

Condensed Matter

Disordered Systems and Neural Networks

6 pages, 5 figures, 1 table, submitted to PRB

Scientific paper

10.1103/PhysRevB.63.184301

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, characterised by a single local quasi-periodicity, supports only modes with acoustic behaviour. 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.

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