Observation of coherent zone-folded acoustic phonons generated by Raman scattering in a superlattice

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2000
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Hawker, Philip
Kent, Anthony J.
Challis, Lawrence J.
Kurz, Heinrich
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Applied Physics Letters. 2000, 77(20), pp. 3209-3211. Available under: doi: 10.1063/1.1324981
Zusammenfassung

We have used pulse time-of-flight techniques to examine the phonon emission from an optically excited GaAs/AlAs superlattice structure. For laser excitation wavelengths shorter than 767 nm (the energy of E1HH1 transition), we detect a significant longitudinal acoustic phonon component directed in a narrow beam normal to the structure. Under identical excitation conditions, generation of coherent longitudinal acoustic phonons has previously been observed in this structure. We suggest that the excitation wavelength and angular characteristics of the longitudinal acoustic emission is consistent with those of propagating modes produced as coherent phonons "leak" from the superlattice structure.

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ISO 690HAWKER, Philip, Anthony J. KENT, Lawrence J. CHALLIS, Albrecht BARTELS, Thomas DEKORSY, Heinrich KURZ, Klaus KÖHLER, 2000. Observation of coherent zone-folded acoustic phonons generated by Raman scattering in a superlattice. In: Applied Physics Letters. 2000, 77(20), pp. 3209-3211. Available under: doi: 10.1063/1.1324981
BibTex
@article{Hawker2000Obser-5119,
  year={2000},
  doi={10.1063/1.1324981},
  title={Observation of coherent zone-folded acoustic phonons generated by Raman scattering in a superlattice},
  number={20},
  volume={77},
  journal={Applied Physics Letters},
  pages={3209--3211},
  author={Hawker, Philip and Kent, Anthony J. and Challis, Lawrence J. and Bartels, Albrecht and Dekorsy, Thomas and Kurz, Heinrich and Köhler, Klaus}
}
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