Raman scattering by folded τα and LA phonons in Si-Si0.5Ge0.5 superlattices
Talochkin A.B. , Markov V. A., Neizvestnyi I. G., Pchelyakov O. P., Sinyukov M. P., Stenin S. I.
The Raman scattering by acoustic phonons in Si—Si0 5 Ge0 5 superlattices with axis along the (111) direction has been studied. The spectra reveal, in addition to the well-known lines of folded LA phonons, an allowed scattering by folded τα phonons. This is the first observation of the latter type of scattering.