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Coherent zone-folded longitudinal acoustic phonons in semiconductor superlattices. Excitation and detection

Kohärente zonengefaltete longitudinale akustische Phononen in Halbleiter-Übergittern. Anregungen und Nachweis
: Bartels, A.; Dekorsy, T.; Kurz, H.; Köhler, K.


Physical review letters 82 (1999), No.5, pp.1044-1047 : Ill., Lit.
ISSN: 0031-9007
Journal Article
Fraunhofer IAF ()
coherent effect; III-V Halbleiter; III-V semiconductor; kohärenter Effekt; superlattice; Übergitter

Coherent zone-folded acoustic phonons are excited in GaAs/AlAs superlattices by femtosecond laser pulses via resonant impulsive stimulated Raman scattering in both forward and backward scattering directions. The relative amplitudes of three distinct modes of first and second backfolded order match well with scattering intensities calculated within an elastic continuum model. The detection of the coherent acoustic modes is based on the modulation of the interband transitions via the acoustic deformation potential and exhibits a strong enhancement at interband transitions.