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Picosecond X-ray studies of coherent folded phonons in a multiple quantum well

Sondhauss, Peter LU ; Larsson, Jörgen LU orcid ; Harbst, Michael LU ; Naylor, G.A. ; Plech, A ; Scheidt, K ; Synnergren, Ola LU ; Wulff, M and Wark, J.S (2005) In Physical Review Letters 94.
Abstract
Coherent folded acoustic phonons in a multilayered GaSb/InAs epitaxial heterostructure were generated by femtosecond laser pulses and studied by means of ultrafast x-ray diffraction. Coherent phonons excited simultaneously in the fundamental acoustic branch and the first back-folded branch were detected. This represents the first clear evidence for phonon branch folding based directly on the atomic motion to which x-ray diffraction is sensitive. From a comparison of the measured phonon-modulated x-ray reflectivity with simulations, evidence was found for a reduction of the laser penetration depth. This reduction can be explained by the self-modulation of the refractive index due to photogenerated free carriers.
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author
; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
94
article number
125509
publisher
American Physical Society
external identifiers
  • wos:000228065600040
  • scopus:18144378800
ISSN
1079-7114
DOI
10.1103/PhysRevLett.94.125509
language
English
LU publication?
yes
id
41b82fda-130e-423f-a4fb-de319449b550 (old id 701738)
date added to LUP
2016-04-04 13:49:38
date last changed
2025-10-14 11:22:26
@article{41b82fda-130e-423f-a4fb-de319449b550,
  abstract     = {{Coherent folded acoustic phonons in a multilayered GaSb/InAs epitaxial heterostructure were generated by femtosecond laser pulses and studied by means of ultrafast x-ray diffraction. Coherent phonons excited simultaneously in the fundamental acoustic branch and the first back-folded branch were detected. This represents the first clear evidence for phonon branch folding based directly on the atomic motion to which x-ray diffraction is sensitive. From a comparison of the measured phonon-modulated x-ray reflectivity with simulations, evidence was found for a reduction of the laser penetration depth. This reduction can be explained by the self-modulation of the refractive index due to photogenerated free carriers.}},
  author       = {{Sondhauss, Peter and Larsson, Jörgen and Harbst, Michael and Naylor, G.A. and Plech, A and Scheidt, K and Synnergren, Ola and Wulff, M and Wark, J.S}},
  issn         = {{1079-7114}},
  language     = {{eng}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{Picosecond X-ray studies of coherent folded phonons in a multiple quantum well}},
  url          = {{https://lup.lub.lu.se/search/files/6214370/2376702.pdf}},
  doi          = {{10.1103/PhysRevLett.94.125509}},
  volume       = {{94}},
  year         = {{2005}},
}