Fermi resonance of optical one-phonon and acoustic two-phonon vibrations in light metals |
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Authors: | O A Dubovskii A V Orlov |
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Institution: | (1) Physics and Power Engineering Institute, 249020 Obninsk, Koluga District, Russia |
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Abstract: | It is shown that the anharmonicity of crystal lattice vibrations in light metals such as beryllium, can give rise to a Fermi
resonance of optical one-phonon and acoustic two-phonon vibrations. New hybridized vibrational states are formed as a result
of such a resonance interaction: biphonon and quasibiphonon vibrations and renormalized optical vibrations. Depending on the
wave vector, these vibrational states can be both damped and stationary. The corresponding dispersion equation is obtained,
whose solution made it possible to determine the spectrum of these vibrations (dispersion curves and the wave vector dependence
of the damping for damped vibrations). It is shown that ultrafast damping of optical vibrations, similar to the well-known
superradiance effect for Frenkel’ and Wannier-Mott excitons, is possible.
Fiz. Tverd. Tela (St. Petersburg) 39, 542–546 (March 1997) |
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