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Time-Dependent Density-Functional TheoryConcepts and Applications$
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Carsten A. Ullrich

Print publication date: 2011

Print ISBN-13: 9780199563029

Published to Oxford Scholarship Online: December 2013

DOI: 10.1093/acprof:oso/9780199563029.001.0001

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Time-dependent current-DFT

Time-dependent current-DFT

Chapter:
(p.213) 10 Time-dependent current-DFT
Source:
Time-Dependent Density-Functional Theory
Author(s):

Carsten A. Ullrich

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199563029.003.0010

This chapter discusses time-dependent current-density-functional theory (TDCDFT). It first asks under what circumstances one should choose the current density as basic variable, instead of the particle density. There are several reasons: a current-based formulation is more suitable for constructing functionals beyond the adiabatic approximation. Furthermore, the current is the natural variable to describe coupling to electromagnetic fields and vector potentials. The basic existence theorems of TDCDFT are proved, and several exact properties and the linear-response regime are discussed. The second half of the chapter deals with the so-called Vignale-Kohn functional, which is a local and frequency-dependent approximation to the exchange-correlation vector potential. The Vignale-Kohn functional is expressed in terms of viscoelastic stresses in the electron liquid. Several applications in the linear-response regime and in real time are presented. The Vignale-Kohn functional works well for describing dissipative effects in collective, plasmon-like electron dynamics.

Keywords:   time-dependent current-density-functional theory, basic variable, linear-response regime, Vignale-Kohn functional, adiabatic approximation, viscoelastic stresses

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