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Heterodyne x-ray diffuse scattering from coherent phonons.

M Kozina, M Trigo, M Chollet1

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Summary
This summary is machine-generated.

We observed coherent acoustic phonons in photoexcited GaAs with ErAs nanoparticles using inelastic x-ray scattering. Nanoparticles enable large wavevector phonon generation, with scattering proportional to phonon amplitude, not occupation.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Nanotechnology

Background:

  • Inelastic X-ray scattering (IXS) typically probes phonon occupation in thermal equilibrium.
  • Understanding coherent phonon dynamics is crucial for ultrafast phenomena.

Purpose of the Study:

  • To investigate coherent acoustic phonon generation and detection in photoexcited GaAs with embedded ErAs nanoparticles.
  • To demonstrate a novel IXS method for probing phonon amplitude.

Main Methods:

  • Fourier-transform inelastic x-ray scattering (FT-IXS) measurements.
  • Photoexcitation of Gallium Arsenide (GaAs) with embedded Erbium Arsenide (ErAs) nanoparticles.
  • Utilizing elastic scattering from nanoparticles for heterodyne mixing.

Main Results:

  • Observed temporal oscillations in IXS intensity, attributed to coherent acoustic phonons.
  • Demonstrated that IXS scattering is proportional to phonon amplitude for coherent states, deviating from thermal equilibrium.
  • Observed phonons with wavevectors exceeding the photoexcitation wavevector.
  • ErAs nanoparticles were shown to break lattice symmetry, enabling large wavevector coherent phonon generation.

Conclusions:

  • Coherent acoustic phonons can be generated and detected in nanostructured semiconductors.
  • The developed FT-IXS technique provides a sensitive probe of coherent phonon amplitude.
  • Nanoparticle-induced lattice symmetry breaking is a viable mechanism for controlling coherent phonon properties.