Münster 1997 – scientific programme

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HL: Halbleiterphysik

HL 40: Poster III

HL 40.37: Poster

Friday, March 21, 1997, 11:00–14:00, Z

Optical Phonons and Resonant Raman Scattering in Superlattices — •V. M. Fomin^1,2, S. N. Klimin¹, E. P. Pokatilov¹, J. T. Devreese², V. N. Gladilin¹, and S. N. Balaban¹ — ¹Department of Theoretical Physics, State University of Moldova, Str. Mateevici 60, MD-2009 Kishinev, Republic of Moldova — ²Departement Natuurkunde, Universitaire Instelling Antwerpen, Universiteitsplein 1, B-2610 Antwerpen, Belgium

A modified continuum theory of polar optical vibrations and of the electron-phonon interaction in multilayer structures is developed taking into account the spatial dispersion with both electrostatic and mechanical boundary conditions. The effective dielectric function of the system is shown to have a multimode character. Due to a finite dimensionality of the basis of vibrations, the obtained eigenmodes are very close to those resulting from microscopic models. The eigenmodes occur to be a mixture of bulk-like and interface modes. Raman scattering spectra are calculated for the short-period superlattice GaAs/AlAs. The predicted peak positions and their intensities reveal an excellent agreement with experimental results [1].

This work is supported by NFWO, WOG (Belgium).

[1] T. Gilmour, P. C. Klipstein, W. R. Tribe, G. W. Smith, submitted to Phys. Rev. B (1996).