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

被引：129

作者：

Cavalleri, A ^{[1
]}

Siders, CW

Brown, FLH

Leitner, DM

Tóth, C

Squier, JA

Barty, CPJ

Wilson, KR

Sokolowski-Tinten, K

von Hoegen, MH

von der Linde, D

Kammler, M

机构：

[1] Univ Calif San Diego, Dept Chem & Biochem, La Jolla, CA 92093 USA

[2] Univ Calif San Diego, Inst Nonlinear Sci, La Jolla, CA 92093 USA

[3] Univ Calif San Diego, Dept Elect Engn, La Jolla, CA 92093 USA

[4] Univ Calif San Diego, Dept Appl Mech & Engn Sci, La Jolla, CA 92093 USA

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 85卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.85.586

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 (T-2) for 7-GHz longitudinal acoustic phonons in germanium.

引用

页码：586 / 589

页数：4

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