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• W2070946179 endingPage "1876" @default.
• W2070946179 startingPage "1865" @default.
• W2070946179 abstract "We report measurements of resonant first- and second-order Raman scattering in GaAs with exciting photon energies covering the entire visible spectrum. Two sets of energy gaps were investigated: the three-dimensional $frac{{E}_{0}}{{E}_{0}}+{ensuremath{Delta}}_{0}$ and the two-dimensional $frac{{E}_{1}}{{E}_{1}}+{ensuremath{Delta}}_{1}$ critical points. The symmetry components of the second-order spectrum were separated and observed structures were interpreted by comparison with neutron scattering data. For a theoretical description of the Raman cross section we used either experimental values or a model description of the electric susceptibility. The resonance behavior could be explained for nearly all observed scattering processes with the exception of $2mathrm{LO}(ensuremath{Gamma})$ and forbidden LO scattering by assuming for first order the electron-one-phonon and for second order the renormalized electron-two-phonon deformation potential coupling. Second-order deformation potentials are given as well as a comparison of the theoretically and experimentally determined ratios of the electron-one-phonon deformation potential near $L$ to that near $ensuremath{Gamma}$. Forbidden LO scattering is explained well by the Frohlich coupling mechanism, not only its resonance shape near ${E}_{0}+{ensuremath{Delta}}_{0}$ and near ${E}_{1}$ but also the ratio of its strength to that of TO scattering. $2mathrm{LO}(ensuremath{Gamma})$ scattering is attributed to an iterated electron-one-phonon scattering process caused also by the Frohlich interaction." @default.
• W2070946179 created "2016-06-24" @default.
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• W2070946179 date "1978-02-15" @default.
• W2070946179 modified "2023-10-16" @default.
• W2070946179 title "Resonant Raman scattering in GaAs" @default.
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• W2070946179 doi "https://doi.org/10.1103/physrevb.17.1865" @default.
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