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Titolo:
Anharmonic lattice dynamics in germanium measured with ultrafast x-ray diffraction
Autore:
Cavalleri, A; Siders, CW; Brown, FLH; Leitner, DM; Toth, C; Squier, JA; Barty, CPJ; Wilson, KR; Sokolowski-Tinten, K; von Hoegen, MH; von der Linde, D; Kammler, M;
Indirizzi:
Univ Calif San Diego, Dept Chem & Biochem, La Jolla, CA 92093 USA Univ Calif San Diego La Jolla CA USA 92093 iochem, La Jolla, CA 92093 USA Univ Calif San Diego, Inst Nonlinear Sci, La Jolla, CA 92093 USA Univ Calif San Diego La Jolla CA USA 92093 ar Sci, La Jolla, CA 92093 USA Univ Calif San Diego, Dept Elect Engn, La Jolla, CA 92093 USA Univ Calif San Diego La Jolla CA USA 92093 t Engn, La Jolla, CA 92093 USA Univ Calif San Diego, Dept Appl Mech & Engn Sci, La Jolla, CA 92093 USA Univ Calif San Diego La Jolla CA USA 92093 gn Sci, La Jolla, CA 92093 USA
Titolo Testata:
PHYSICAL REVIEW LETTERS
fascicolo: 3, volume: 85, anno: 2000,
pagine: 586 - 589
SICI:
0031-9007(20000717)85:3<586:ALDIGM>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
PULSES; GENERATION; SURFACE; FILMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Cavalleri, A Univ Calif San Diego, Dept Chem & Biochem, La Jolla, CA 92093USA Univ Calif San Diego La Jolla CA USA 92093 lla, CA 92093 USA
Citazione:
A. Cavalleri et al., "Anharmonic lattice dynamics in germanium measured with ultrafast x-ray diffraction", PHYS REV L, 85(3), 2000, pp. 586-589

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 calculatedtemperature of the thermal bath is consistent with estimated four-body, elastic dephasing times (T-2) for 7-GHz longitudinal acoustic phonons in germanium.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/09/20 alle ore 18:38:33