Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 25: Correlated Electrons - Poster Session

TT 25.97: Poster

Mittwoch, 29. März 2006, 14:30–18:30, P1

Dynamical local field corrections — •K. Morawetz — Institute of Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany — Max-Planck-Institute for the Physics of Complex Systems, Nöthnitzer Str. 38, 01187 Dresden, Germany

The finite temperature dynamical response function including the dynamical local field is derived within a quasiparticle picture for interacting one-, two- and three dimensional Fermi systems. The correlations are assumed to be given by a density dependent effective mass, quasiparticle energy and a mean momentum shift as well as a relaxation time. The latter one describes disorder or collisional effects. The mean momentum ensures the zero order frequency sum rule. With a single static local field, the third order frequency sum rule can be fulfilled simultaneously with the compressibility sum rule by relating the effective mass and quasiparticle energy shift to the structure function or pair correlation function. This parameterization of correlations includes local density functionals as a special case and is therefore applicable for density functional theories though the latter ones cannot fullfill both sum rules simultaneously. The comparison to the Monte-Carlo data seems to support such quasiparticle picture.

[1] K. Morawetz, Phys. Rev. B 66 (2002) 07512