Time-dependent density functional theory beyond the adiabatic local density approximation

Details Time-dependent density functional theory beyond the adiabatic local density approximation Time-dependent density functional theory beyond the adiabatic local density approximation

1997-06-30

arxiv.org/abs/cond-mat/9706306v1

Phys. Rev. Lett. 79, 4878 (1997)

Physics

Condensed Matter

RevTeX, 4 pages

Scientific paper

10.1103/PhysRevLett.79.4878

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.

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