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, Klaus; Horn-von Hoegen, Michael; von der Linde, Dietrich; Kammler, Martin:
Anharmonic lattice dynamics in Germanium measured with ultrafast x-ray diffraction
2000
In: Physical Review Letters, Jg. 85 (2000), Heft 3, S. 586 - 589
Artikel/Aufsatz in Zeitschrift / Fach: Physik
Fakultät für Physik » Experimentalphysik
Titel:
Anharmonic lattice dynamics in Germanium measured with ultrafast x-ray diffraction
Autor(in):
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, Klaus im Online-Personal- und -Vorlesungsverzeichnis LSF anzeigen; Horn-von Hoegen, Michael im Online-Personal- und -Vorlesungsverzeichnis LSF anzeigen; von der Linde, Dietrich im Online-Personal- und -Vorlesungsverzeichnis LSF anzeigen; Kammler, Martin im Online-Personal- und -Vorlesungsverzeichnis LSF anzeigen
Erscheinungsjahr
2000
Erschienen in:
Physical Review Letters, Jg. 85 (2000), Heft 3, S. 586 - 589
ISSN
ISSN
WWW URL

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.