EZZAHRI, Younès; GRAUBY, Stéphane; RAMPNOUX, Jean-Michel; MICHEL, Hélène; PERNOT, Gilles; CLAEYS, W.; DILHAIRE, Stefan; ROSSIGNOL, Clément; ZENG, G.; SHAKOURI, Ali

doi:10.1103/PhysRevB.75.195309

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EZZAHRI, Younès
Centre de physique moléculaire optique et hertzienne [CPMOH]

GRAUBY, Stéphane
Centre de physique moléculaire optique et hertzienne [CPMOH]

RAMPNOUX, Jean-Michel
Centre de physique moléculaire optique et hertzienne [CPMOH]

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Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2007, vol. 75, n° 19, p. 195309

American Physical Society

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There are several classes of coherent phonons whose generation mechanisms are completely different: impulsive stimulated Raman scattering, Brillouin oscillations, and coherent longitudinal-acoustic-phonon Bragg reflection. All of these are investigated in Si/ SiGe superlattices using a picosecond ultrasonics technique at room temperature. Bragg reflection for a single vibrational mode is related to gaps in the phonon-dispersion relation at the center and the boundary of the folded Brillouin zone. The two lowest minigaps are observed at 283 and 527 GHz. Theoretical calculations of phonon-dispersion relation and phonon reflection rate are given to explain experimental results.< Leer menos

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Coherent phonons in Si/ SiGe superlattices

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