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    Time-dependent density functional theory: Derivation of gradient-corrected dynamical exchange-correlational potentials

    Tao, Jianmin
    Vignale, Giovanni, 1957-
    Tokatly, I. V.
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    [PDF] TimeDependentDensityFunctionalTheoryDerivation.pdf (765.4Kb)
    Date
    2007
    Format
    Article
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    Abstract
    We have recently proposed an approximation for the dynamical exchange-correlation (XC) potentials of time-dependent current-density functional theory beyond the local density approximation [Phys. Rev. Lett. 97, 036403 (2006)]. The novel feature of the approximation is that the dependence of the dynamical XC potentials upon the density gradient and other inhomogeneity parameters (e.g., the Laplacian of the density and the kinetic energy density) is introduced by applying the generalized gradient approximation (GGA) and meta-GGA to the calculation of the XC stress tensor. The scheme may allow a more accurate treatment of the dynamical properties of an inhomogeneous system, while reducing to the exact form for slowly varying densities and slowly varying external potentials. In this work, we present in detail the derivation of this XC potential, spell out the underlying assumptions, and explain their physical basis.
    URI
    http://hdl.handle.net/10355/7728
    Citation
    Phys. Rev. B 76, 195126 (2007) [13 pages]
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