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Picosecond x-ray studies of coherent folded acoustic phonons in a periodic semiconductor heterostructure

Författare:
Publiceringsår: 2006
Språk: Engelska
Sidor: V1180-V1180
Publikation/Tidskrift/Serie: Proceedings of SPIE - The International Society for Optical Engineering
Volym: 6118
Dokumenttyp: Konferensbidrag
Förlag: International Society for Optical Engineering

Sammanfattning

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.

Disputation

Nyckelord

  • Technology and Engineering
  • Zone-folded phonons
  • Time resolved X-ray diffraction
  • Coherent phonons

Övriga

Ultrafast Phenomena in Semiconductors and Nanostructure Materials X
2014-01-24
San Jose, CA, United States
Published
Yes
  • ISSN: 0277-786X

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