Time-resolved X-ray diffraction from coherent phonons during a laser-induced phase transition

被引：332

作者：

Lindenberg, AM ^{[1
]}

Kang, I

Johnson, SL

Missalla, T

Heimann, PA

Chang, Z

Larsson, J

Bucksbaum, PH

Kapteyn, HC

Padmore, HA

Lee, RW

Wark, JS

Falcone, RW

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA

[3] Univ Michigan, Ctr Ultrafast Opt Sci, Ann Arbor, MI 48109 USA

[4] Lund Inst Technol, Atom Phys Div, Lund, Sweden

[5] Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

[6] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

[7] Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Beam Phys, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 84卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.84.111

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Time-resolved x-ray diffraction with picosecond temporal resolution is used to observe scattering from impulsively generated coherent acoustic phonons in laser-excited InSb crystals. The observed frequencies and damping rates are in agreement with a model based on dynamical diffraction theory coupled to analytic solutions for the laser-induced strain profile. The results are consistent with a 12 ps thermal electron-acoustic phonon coupling time together with an instantaneous component from the deformation-potential interaction. Above a critical laser fluence, we show that the first step in the transition to a disordered state is the excitation of large amplitude, coherent atomic motion.

引用

页码：111 / 114

页数：4

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