Phys. Rev. B 63, 184301 (2001) [5 pages]Connection between vibrational dynamics and topological order in simple glassesReceived 28 November 2000; published 18 April 2001 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. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.63.184301
DOI:
10.1103/PhysRevB.63.184301
PACS:
63.50.+x, 61.43.Bn, 81.05.Kf
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