Imaging nonequilibrium atomic vibrations with x-ray diffuse scattering.
Phys Rev B Condens Matter Mater Phys
; 82(23): 235205-235209, 2010 Dec 15.
Article
em En
| MEDLINE
| ID: mdl-21580798
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.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Phys Rev B Condens Matter Mater Phys
Ano de publicação:
2010
Tipo de documento:
Article
País de afiliação:
Estados Unidos