Imaging nonequilibrium atomic vibrations with x-ray diffuse scattering

被引：48

作者：

Trigo, M. ^{[1
]}

Chen, J. ^{[1
]}

Vishwanath, V. H. ^{[1
]}

Sheu, Y. M. ^{[2
,3
]}

Graber, T. ^{[4
]}

Henning, R. ^{[4
]}

Reis, D. A. ^{[1
,5
]}

机构：

[1] SLAC Natl Accelerator Lab, PULSE Inst, Menlo Pk, CA 94025 USA

[2] Univ Michigan, FOCUS Ctr, Ann Arbor, MI 48109 USA

[3] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

[4] Univ Chicago, Ctr Adv Radiat Sources, Chicago, IL 60637 USA

[5] Stanford Univ, Dept Photon Sci & Appl Phys, Stanford, CA 94305 USA

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 23期

基金：

美国国家卫生研究院;

关键词：

SINGULAR-VALUE DECOMPOSITION; III-V SEMICONDUCTORS; PHONONS; SPECTRUM; CRYSTAL;

D O I：

10.1103/PhysRevB.82.235205

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We use picosecond x-ray diffuse scattering to image the nonequilibrium vibrations in the lattice following ultrafast laser excitation. We present images of nonequilibrium phonons in InP and InSb throughout the Brillouin zone which remain out of equilibrium up to nanoseconds. The results are analyzed using a Born model that helps identify the phonon branches contributing to the observed features in the time-resolved diffuse scattering. In InP this analysis shows a delayed increase in the transverse-acoustic (TA) phonon population along high-symmetry directions accompanied by a decrease in the longitudinal-acoustic phonons. In InSb the increase in TA phonon population is less directional.

引用

页数：5

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