2001/03/16 by Krzysztof Tatarczyk, Arno Schindlmayr, Matthias Scheffler · 1 citation
Materials Science · Physics and Astronomy · #Photorefractive and Nonlinear Optics #Quantum optics and atomic interactions #Solid-state spectroscopy and crystallography #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.63.235106
published as Phys. Rev. B 63, 235106 (2001). · 7 pages including 5 figures, RevTeX
arxiv created 2001/03/16 · openalex publication_date 2001/05/14 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
The performance of several common approximations for the exchange-correlation kernel within time-dependent density-functional theory is tested for elementary excitations in the homogeneous electron gas. Although the adiabatic local-density approximation gives a reasonably good account of the plasmon dispersion, systematic errors are pointed out and traced to the neglect of the wave-vector dependence. Kernels optimized for atoms are found to perform poorly in extended systems due to an incorrect behavior in the long-wavelength limit, leading to quantitative deviations that significantly exceed the experimental error bars for the plasmon dispersion in the alkali metals.