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Intrinsic lifetimes and anharmonic frequency shifts of long-wavelength optical phonons in polar crystals

URN to cite this document:
urn:nbn:de:bvb:355-epub-19705
Deinzer, Gernot ; Schmitt, Michael ; Mayer, Andreas P. ; Strauch, Dieter
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Date of publication of this fulltext: 05 Aug 2009 13:35


Abstract

Quantitative calculations of phonon lifetimes due to anharmonic three-phonon processes require knowledge of cubic anharmonic coupling coefficients. In order to determine the temperature dependence of phonon frequencies, anharmonic force constants of up to fourth order are needed. In polar crystals, the macroscopic electric field gives rise to nonanalytic terms in these coefficients. It is shown ...

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