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Imaging Nonequilibrium Atomic Vibrations with X-ray Diffuse Scattering by Trigo, M.; Sheu, Y. M; Chen, J.; Vishwanath, V. H.; Graber, T.; Henning, R.; Reis, D. A. is a scholarly article available to read on EtoBox.

What is Imaging Nonequilibrium Atomic Vibrations with X-ray Diffuse Scattering about?

For over a century, x-ray scattering has been the most powerful tool for determining the equilibrium structure of crystalline materials. Deviations from perfect periodicity, for example due to thermal motion of the atoms, reduces the intensity of the Bragg peaks as well as produces structure in the diffuse scattering background. Analysis of the thermal diffuse scattering (TDS) had been used to determine interatomic force constants and phonon dispersion in relatively simple cases before inelastic neutron scattering became the preferred technique to study lattice dynamics. With the advent of intense synchrotron x-ray sources, there was a renewed interest in TDS for measuring phonon dispersion. The relatively short x-ray pulses emanating from these sources also enables the measurement of phonon dynamics in the time domain. Prior experiments on nonequilibrium phonons were either limited by time-resolution and/or to relatively long wavelength excitations. Here we present the first images of nonequilibrium phonons throughout the Brillouin zone in photoexcited III-V semiconductors, indium-phosphide and indium-antimonide, using picosecond time-resolved diffuse scattering. In each case, we

Author

Trigo, M.; Sheu, Y. M; Chen, J.; Vishwanath, V. H.; Graber, T.; Henning, R.; Reis, D. A.

Published

2010

Language

EN