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Anharmonic lattice dynamics in germanium measured with ultrafast x-ray diffraction.

Abstract:

Damping of impulsively generated coherent acoustic oscillations in a femtosecond laser-heated thin germanium film is measured as a function of fluence by means of ultrafast x-ray diffraction. By simultaneously measuring picosecond strain dynamics in the film and in the unexcited silicon substrate, we separate anharmonic damping from acoustic transmission through the buried interface. The measured damping rate and its dependence on the calculated temperature of the thermal bath is consistent w...

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Publication status:
Published

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Publisher copy:
10.1103/physrevlett.85.586

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Institution:
University of Oxford
Department:
Oxford, MPLS, Physics, Atomic and Laser Physics
Role:
Author
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Journal:
Physical review letters
Volume:
85
Issue:
3
Pages:
586-589
Publication date:
2000-07-05
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
URN:
uuid:c0934194-7d58-401b-97fb-f9c21e463e4c
Source identifiers:
14105
Local pid:
pubs:14105
Language:
English

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