Coherent phonons in Si/ SiGe superlattices

Abstract : 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.
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Physical Review B : Condensed matter and materials physics, American Physical Society, 2007, 75 (19), pp. 195309. 〈10.1103/PhysRevB.75.195309〉
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Younès Ezzahri, Stéphane Grauby, Jean-Michel Rampnoux, Hélène Michel, Gilles Pernot, et al.. Coherent phonons in Si/ SiGe superlattices. Physical Review B : Condensed matter and materials physics, American Physical Society, 2007, 75 (19), pp. 195309. 〈10.1103/PhysRevB.75.195309〉. 〈hal-01535961〉

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