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Related Experiment Video

Updated: Jun 1, 2026

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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Imaging nonequilibrium atomic vibrations with x-ray diffuse scattering.

M Trigo1, J Chen, V H Vishwanath

  • 1PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.

Physical Review. B, Condensed Matter and Materials Physics
|May 18, 2011
PubMed
Summary
This summary is machine-generated.

Ultrafast laser excitation creates long-lived, nonequilibrium vibrations (phonons) in InP and InSb crystals, observed using x-ray scattering. These lattice vibrations persist out of equilibrium for nanoseconds, revealing distinct phonon behaviors in different materials.

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Area of Science:

  • Solid-state physics
  • Materials science
  • Ultrafast spectroscopy

Background:

  • Understanding lattice dynamics is crucial for material properties.
  • Nonequilibrium phonon behavior influences thermal and electronic transport.
  • Time-resolved imaging of phonons provides insights into energy relaxation pathways.

Purpose of the Study:

  • To image and characterize nonequilibrium phonon populations after ultrafast laser excitation.
  • To investigate the persistence and spatial distribution of these phonons.
  • To identify specific phonon branches involved in the observed dynamics.

Main Methods:

  • Picosecond x-ray diffuse scattering technique.
  • Time-resolved imaging of lattice vibrations.
  • Analysis using a Born model for phonon identification.

Main Results:

  • Observed nonequilibrium phonons in Indium Phosphide (InP) and Indium Antimonide (InSb) throughout the Brillouin zone.
  • Phonons remained out of equilibrium for up to nanoseconds.
  • In InP, a delayed increase in transverse-acoustic (TA) phonons and decrease in longitudinal-acoustic phonons were observed along high-symmetry directions.
  • In InSb, the TA phonon increase was less directional.

Conclusions:

  • Nonequilibrium phonon populations can persist for extended periods after excitation.
  • The dynamics and distribution of phonons differ between InP and InSb.
  • The study provides insights into ultrafast energy transfer and relaxation mechanisms in semiconductors.