Raman Scattering, Luminescence, and Exciton-Phonon Coupling in ${Cu}_{2}$ O

Raman scattering and exciton luminescence and absorption have been studied in high-purity single-crystal

{Cu}_{2}

O at liquid-helium temperature using 4880-Å laser excitation. The Raman-active mode has been unambiguously identified at 515

{cm}^{- 1}

, and the first observation made of luminescence from the

n = 2, 3, 4

yellow excitons and their continuum. Comparison of the Raman spectra with the absorption and luminescence spectra near the

n = 1

exciton has clarified the origin of the strong 220-

{cm}^{- 1}

Raman feature and yielded evidence for wave-vector-independent and wave-vector-dependent exciton-phonon coupling, respectively, for the

Γ_{12}^{-}

and

Γ_{15}^{-}

optic phonons.

This publication has 18 references indexed in Scilit:

Raman Scattering, Luminescence, and Exciton-Phonon Coupling inCu2O