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Probing unfolded acoustic phonons with X rays.

M Trigo1, Y M Sheu, D A Arms

  • 1Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA. mtrigo@umich.edu

Physical Review Letters
|September 4, 2008
PubMed
Summary
This summary is machine-generated.

Ultrafast lasers generate acoustic phonons in superlattices that transfer to substrates. Time-resolved X-ray diffraction detects these large-wave vector phonons in the bulk substrate.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Ultrafast spectroscopy

Background:

  • Ultrafast laser excitation of semiconductor heterostructures can generate coherent acoustic phonons.
  • Phonon propagation and energy transfer from superlattices to substrates are critical for understanding energy dissipation and device performance.
  • Characterizing large-wave vector phonons in bulk materials presents significant experimental challenges.

Purpose of the Study:

  • To investigate the generation and propagation of coherent folded acoustic phonons in an InGaAs/InAlAs superlattice.
  • To demonstrate the transfer of these phonons into the bulk InP substrate.
  • To show that time-resolved X-ray diffraction can detect these phonons in the substrate, even when they acquire a large wave vector.

Main Methods:

  • Ultrafast laser excitation of an InGaAs/InAlAs superlattice.
  • Time-resolved X-ray diffraction measurements.
  • Dynamical diffraction simulations.

Main Results:

  • Coherent folded acoustic phonons were generated in the superlattice by ultrafast laser excitation.
  • These phonons were observed to leak into the bulk InP substrate.
  • Time-resolved X-ray diffraction successfully detected the large-wave vector excitation in the substrate.
  • Experimental results were consistent with dynamical diffraction simulations.

Conclusions:

  • Ultrafast laser excitation is an effective method for generating coherent acoustic phonons in superlattices.
  • Phonon transfer from superlattices to substrates can lead to the generation of large-wave vector modes in the substrate.
  • Time-resolved X-ray diffraction is a powerful technique for probing ultrafast dynamics and large-wave vector excitations in materials.