Journal
JOURNAL OF APPLIED PHYSICS
Volume 127, Issue 16, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/5.0004523
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Funding
- Nikki-Saneyoshi Foundation
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The absorption of light by a metal disturbs the electron distribution around the Fermi surface. Here, we calculate the phonon dispersion relations of free-electron-like metal, bcc sodium, with a stepwise electron distribution function by using a model potential. The step can behave as a pseudo-Fermi surface, which produces singularities at specific wave numbers in the response function. The singularity gives rise to long-range oscillations in the interatomic potential and results in phonon softening along the Gamma -N direction. The effect of the smearing in the step function is also discussed.
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