Phonon spectrum of a model of electronically excited silicon
- 15 August 1982
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 26 (4), 1980-1988
- https://doi.org/10.1103/physrevb.26.1980
Abstract
With a view to clarifying the process proposed in the plasma-annealing hypothesis for laser-induced recrystallization, we have performed a simple calculation of phonon frequencies in electronically excited silicon. We make assumptions most favorable to the plasma-annealing hypothesis, i.e., we assume that the laser energy remains in the electronic system. We use a one-parameter interpolation of the electronic dielectric constant between the bond charge and the free-electron models in a computation of the phonon spectrum. The calculation yields a softening of the [111] zone-boundary transverse-acoustic phonons. Typically, such a softening would be thought to lead to a structural phase transition. The excited electron densities needed for this softening are in the range (6-10)× which seems unreasonably large to us. Thus, on two counts, we have grounds for rejecting the plasma-annealing hypothesis.
Keywords
This publication has 24 references indexed in Scilit:
- Synchrotron X-Ray Diffraction Study of Silicon during Pulsed-Laser AnnealingPhysical Review Letters, 1982
- Measurement of the Velocity of the Crystal-Liquid Interface in Pulsed Laser Annealing of SiPhysical Review Letters, 1982
- Measurement of Lattice Temperature of Silicon during Pulsed Laser AnnealingPhysical Review Letters, 1981
- Macroscopic theory of pulsed-laser annealing. I. Thermal transport and meltingPhysical Review B, 1981
- Laser Annealing of Damaged Silicon Covered with a Metal Film: Test for Epitaxial Growth from the MeltPhysical Review Letters, 1981
- Raman Measurement of Lattice Temperature during Pulsed Laser Heating of SiliconPhysical Review Letters, 1980
- Dynamics of dense laser-induced plasmasPhysical Review B, 1980
- Nonthermal pulsed laser annealing of Si; plasma annealingPhysics Letters A, 1979
- Reasons to believe pulsed laser annealing of Si does not involve simple thermal meltingPhysics Letters A, 1979
- Some features of laser annealing of implanted silicon layersRadiation Effects, 1978