Coulomb effects in glasses

S. W. De Leeuw, M. F. Thorpe

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Numerical simulation techniques were used to study the vibrational properties of random networks. The networks, containing up to 1500 ions, were generated by the introduction of a large number of defects in regular crystals. Periodic boundary conditions were imposed. Long-range Coulomb effects were included for the first time. Our simulations reveal the existence of long-wavelength optic-type excitations which exhibit LO-TO splitting similar to crystalline solids. The LO-mode has a negative dispersion, whereas almost no dispersion is observed for the TO-mode. In the density of states, the TO-mode shows up as a peak, whereas the LO-mode defines the high frequency band edge.

Original languageEnglish (US)
Pages (from-to)393-398
Number of pages6
JournalJournal of Non-Crystalline Solids
Volume75
Issue number1-3
DOIs
StatePublished - Oct 1985

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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