Abstract
It is shown that in GaAs-AlAs superlattices the confined longitudinal-optic Raman phonons created via either deformation-potential or Fröhlich electron-phonon interaction are different. This effect is demonstrated by comparison of resonance and off-resonance Raman spectra. Phonons of symmetry (point group ) dominate in resonance, while phonons are stronger in the off-resonance case. The resonance profile of the modes is discussed. We also report the observation of confined transverse-optic phonons under extremely resonant conditions.
- Received 5 February 1985
DOI:https://doi.org/10.1103/PhysRevLett.54.2111
©1985 American Physical Society