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

In English

Författare

Summary, in English

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.

Publiceringsår

2006

Språk

Engelska

Sidor

1180-1180

Publikation/Tidskrift/Serie

Proceedings of SPIE - The International Society for Optical Engineering

Volym

6118

Dokumenttyp

Konferensbidrag

Förlag

International Society for Optical Engineering

Ämne

  • Atom and Molecular Physics and Optics
  • Physical Sciences
  • Natural Sciences

Nyckelord

  • Zone-folded phonons
  • Time resolved X-ray diffraction
  • Coherent phonons

Conference name

Ultrafast Phenomena in Semiconductors and Nanostructure Materials X

Conference date

2006-01-23 - 2006-01-25

Conference place

San Jose, CA, United States

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0277-786X
  • ISSN: 1996-756X