Imaging nonequilibrium atomic vibrations with x-ray diffuse scattering

M. Trigo*, J. Chen, V. H. Vishwanath, Yu-Miin Sheu, T. Graber, R. Henning, D. A. Reis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

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.

Original languageEnglish
Article number235205
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number23
DOIs
StatePublished - 10 Dec 2010

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