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

G. Deinzer, M. Schmitt, A. P. Mayer, and D. Strauch
Phys. Rev. B 69, 014304 – Published 30 January 2004
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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 how these non-analytic terms can be determined from other physical quantities including higher-order dipole moments, Raman coefficients, and nonlinear susceptibilities. The contribution of these terms to the intrinsic damping of the long-wavelength optical phonon modes in GaAs has been determined by an ab initio calculation.

  • Received 13 June 2003

DOI:https://doi.org/10.1103/PhysRevB.69.014304

©2004 American Physical Society

Authors & Affiliations

G. Deinzer, M. Schmitt, A. P. Mayer, and D. Strauch

  • Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany

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Vol. 69, Iss. 1 — 1 January 2004

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