Electronic Contribution to Lattice Dynamics in Insulating Crystals
- 15 December 1969
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 188 (3) , 1431-1439
- https://doi.org/10.1103/physrev.188.1431
Abstract
The electron contribution to the phonon spectrum is formulated in terms of the microscopic response function. The long-wavelength behavior of the lattice vibration is then investigated, with due attention to the long-range Coulomb interaction. An important quantity which emerges is the effective charge of the vibrating nuclei, which is shown to obey a sum rule. From this follows the existence of long-wavelength acoustic phonos. The infrared optical constants are also expressed in terms of the microscopic response function.Keywords
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