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

Hawker, Philip; Kent, Anthony J.; Challis, Lawrence J.; Bartels, Albrecht; Dekorsy, Thomas; Kurz, Heinrich; Köhler, Klaus

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

Files

Observation_of_coherent_zone_folded_acoustic_phonons_generated_by_Raman_scattering_in_a_superlattice.pdf(86 KB)

Date

2000

Authors

Hawker, Philip

Kent, Anthony J.

Challis, Lawrence J.

Bartels, Albrecht

Dekorsy, Thomas

Kurz, Heinrich

Köhler, Klaus

Publication type

Journal article

Published in

Applied Physics Letters ; 77 (2000), 20. - pp. 3209-3211

Abstract

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.

Subject (DDC)

530 Physics

Cite This

ISO 690

HAWKER, 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. 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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