Exchange-correlation kernels for excited states in solids

Details Exchange-correlation kernels for excited states in solids Exchange-correlation kernels for excited states in solids

2001-03-16

arxiv.org/abs/cond-mat/0103357v1

Phys. Rev. B 63, 235106 (2001).

Physics

Condensed Matter

Materials Science

7 pages including 5 figures, RevTeX

Scientific paper

10.1103/PhysRevB.63.235106

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 wavevector 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.

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