Current-dependent exchange-correlation potential for dynamical linear response theory

G. Vignale; Walter Kohn

doi:10.1103/physrevlett.77.2037

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arXiv · cond-mat/9605052

Current-dependent exchange-correlation potential for dynamical linear response theory

G. Vignale·Walter Kohn

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Abstract

The frequency-dependent exchange-correlation potential, which appears in the usual Kohn-Sham formulation of a time-dependent linear response problem, is a strongly nonlocal functional of the density, so that a consistent local density approximation generally does not exist. This problem can be avoided by choosing the current-density as the basic variable in a generalized Kohn-Sham theory. This theory admits a local approximation which, for fixed frequency, is exact in the limit of slowly varying densities and perturbing potentials.

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G. Vignale, Walter Kohn. 1996-05-08. Current-dependent exchange-correlation potential for dynamical linear response theory. https://doi.org/10.1103/physrevlett.77.2037

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