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- W2016460741 abstract "We have measured the temperature dependence of the polariton damping function ${ensuremath{Gamma}}_{ensuremath{pi}}({ensuremath{omega}}_{ensuremath{pi}},T)$ for the polariton frequency ${ensuremath{omega}}_{ensuremath{pi}}ensuremath{simeq}345$ ${mathrm{cm}}^{ensuremath{-}1}$ in GaP in the temperature range 2-300 ifmmode^circelsetextdegreefi{}K. The temperature dependence of ${ensuremath{Gamma}}_{ensuremath{pi}}({ensuremath{omega}}_{ensuremath{pi}},T)$ shows that the predominant mechanism of polariton damping at this frequency is a decay process of the polaritons into two acoustic phonons of approximate frequencies 242 and 103 ${mathrm{cm}}^{ensuremath{-}1}$ via the third-order anharmonic interaction. Inelastic-neutron-scattering data show that these frequencies correspond to acoustic phonons, $mathrm{TA}(X)$ and $mathrm{LA}(X)$, near the $X$ point of the Brillouin zone. Thus the present experiment establishes the predominant source of the contributions to the imaginary part of the phonon self-energy." @default.
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- W2016460741 date "1973-11-15" @default.
- W2016460741 modified "2023-10-16" @default.
- W2016460741 title "Damping Mechanism of Polaritons in GaP" @default.
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- W2016460741 doi "https://doi.org/10.1103/physrevb.8.4634" @default.
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