15 February 2006 Picosecond x-ray studies of coherent folded acoustic phonons in a periodic semiconductor heterostructure
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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.
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Peter Sondhauss, Jörgen Larsson, Michael Harbst, Graham A. Naylor, Anton Plech, Kees-Bertus Scheidt, Ola Synnergren, Michael Wulff, Justin S. Wark, "Picosecond x-ray studies of coherent folded acoustic phonons in a periodic semiconductor heterostructure", Proc. SPIE 6118, Ultrafast Phenomena in Semiconductors and Nanostructure Materials X, 61180V (15 February 2006); doi: 10.1117/12.641144; https://doi.org/10.1117/12.641144
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