Abstract
The equation-of-motion technique has been used to study the optic response functions of a computer-generated periodic random network containing 1536 ions. Long-range Coulomb effects were included for the first time. Our results show unambiguously the existence of an LO-TO splitting. The long-wavelength LO response function peaks at the band edge in the density of states and is very sharp, whereas the log-wavelength TO response function peaks at a lower frequency and is much broader.
Original language | English (US) |
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Pages (from-to) | 2879-2882 |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 55 |
Issue number | 26 |
DOIs | |
State | Published - Jan 1 1985 |
ASJC Scopus subject areas
- General Physics and Astronomy