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Proceedings Paper

Picosecond x-ray studies of coherent folded acoustic phonons in a periodic semiconductor heterostructure
Author(s): Peter Sondhauss; Jörgen Larsson; Michael Harbst; Graham A. Naylor; Anton Plech; Kees-Bertus Scheidt; Ola Synnergren; Michael Wulff; Justin S. Wark
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Paper Abstract

Zone folded coherent acoustic phonons were generated in a multilayered GaSb/InAs epitaxial heterostructure via rapid heating by femtosecond laser pulses. These phonons were probed by means of ultrafast x-ray diffraction. Phonons both from 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 absorption index due to photogenerated free carriers.

Paper Details

Date Published: 15 February 2006
PDF: 11 pages
Proc. SPIE 6118, Ultrafast Phenomena in Semiconductors and Nanostructure Materials X, 61180V (15 February 2006); doi: 10.1117/12.641144
Show Author Affiliations
Peter Sondhauss, Lund Univ. (Sweden)
Jörgen Larsson, Lund Univ. (Sweden)
Michael Harbst, Lund Univ. (Sweden)
Graham A. Naylor, European Synchrotron Radiation Facility (France)
Anton Plech, European Synchrotron Radiation Facility (France)
Kees-Bertus Scheidt, European Synchrotron Radiation Facility (France)
Ola Synnergren, Malmö Univ. (Sweden)
Lund Univ. (Sweden)
Michael Wulff, European Synchrotron Radiation Facility (France)
Justin S. Wark, Univ. of Oxford (United Kingdom)

Published in SPIE Proceedings Vol. 6118:
Ultrafast Phenomena in Semiconductors and Nanostructure Materials X
Kong-Thon Tsen; Jin-Joo Song; Hongxing Jiang, Editor(s)

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