Phys. Rev. Lett. 77, 2037–2040 (1996)Current-Dependent Exchange-Correlation Potential for Dynamical Linear Response TheoryReceived 26 April 1996; published in the issue dated 2 September 1996 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. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.77.2037
DOI:
10.1103/PhysRevLett.77.2037
PACS:
71.45.Gm, 73.20.Dx, 73.20.Mf, 78.30.Fs
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