Coherent phonons in Si/ SiGe superlattices

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.

Domaines

Science des matériaux [cond-mat.mtrl-sci] Optique [physics.optics] Acoustique [physics.class-ph]

Fichier principal

2007 - Ezzahri et al. - Coherent phonons in Si SiGe superlattices.pdf (1.01 Mo)

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https://hal.univ-lorraine.fr/hal-01535961

Soumis le : vendredi 9 juin 2017-17:37:31

Dernière modification le : mercredi 12 juillet 2023-15:23:41

Archivage à long terme le : dimanche 10 septembre 2017-13:20:18

Dates et versions

hal-01535961 , version 1 (09-06-2017)

Identifiants

HAL Id : hal-01535961 , version 1
DOI : 10.1103/PhysRevB.75.195309

Citer

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 (1998-2015), 2007, 75 (19), pp. 195309. ⟨10.1103/PhysRevB.75.195309⟩. ⟨hal-01535961⟩

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