Anharmonic lattice dynamics in Germanium measured with ultrafast x-ray diffraction
In: Physical Review Letters, Vol. 85 (2000), No. 3, pp. 586 - 589
2000article/chapter in journal
Physics (incl. Astronomy)Faculty of Physics » Experimental Physics
Related: 1 publication(s)
Title:
Anharmonic lattice dynamics in Germanium measured with ultrafast x-ray diffraction
Author:
Cavalleri, Andrea;Siders, Craig W.;Brown, F.L.H.;Leitner, D.M.;Tóth, Csaba;Squier, J.A.;Barty, Christopher P.P.;Wilson, Kent R.;Sokolowski-Tinten, KlausUDE
- GND
- 172725364
- LSF ID
- 13459
- ORCID
-
0000-0002-7979-5357
- Other
- connected with university
- GND
- 1201039908
- LSF ID
- 10366
- ORCID
-
0000-0003-0324-3457
- Other
- connected with university
- GND
- 121993092X
- LSF ID
- 10402
- ORCID
-
0000-0001-5618-3879
- Other
- connected with university
- LSF ID
- 50189
- Other
- connected with university
Year of publication:
2000
Appears in
Place of publication:
College Park
Publisher:
American Physical Society (APS)
in:
Vol. 85 (2000), No. 3, pp. 586 - 589
ISSN
ISSN
ZDB ID
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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 with estimated four-body, elastic dephasing times (T2) for 7-GHz longitudinal acoustic phonons in germanium.