Time-Dependent Density Functional Theory Beyond the Adiabatic Local Density Approximation

G. Vignale, C. A. Ullrich, and S. Conti
Phys. Rev. Lett. 79, 4878 – Published 15 December 1997
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Abstract

In the current density functional theory of linear and nonlinear time-dependent phenomena, the treatment of exchange and correlation beyond the level of the adiabatic local density approximation is shown to lead to the appearance of viscoelastic stresses in the electron fluid. Complex and frequency-dependent viscosity/elasticity coefficients are microscopically derived and expressed in terms of properties of the homogeneous electron gas. As a first consequence of this formalism, we provide an explicit formula for the linewidths of collective excitations in electronic systems.

  • Received 27 June 1997

DOI:https://doi.org/10.1103/PhysRevLett.79.4878

©1997 American Physical Society

Authors & Affiliations

G. Vignale and C. A. Ullrich

  • Department of Physics, University of Missouri, Columbia, Missouri 65211

S. Conti

  • Scuola Normale Superiore, I-56126 Pisa, Italy

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Vol. 79, Iss. 24 — 15 December 1997

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