Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 27: CE: Poster Session
TT 27.48: Poster
Wednesday, March 24, 2010, 14:00–18:00, Poster D1
Influence of Spin Fluctuation on the Single and Two Particle Properties of Two Dimensional Correlated System — •B.D Napitu1,2 and J Berakdar1 — 1Martin-Luther-Universität Halle-Wittenberg, Institut für Physik Heinrich-Damerow-Str.4 D-06120 Halle (Saale),Germany — 2Max-Planck-Institut für Mikrostrukturphysik Weinberg 2, D-06120 Halle, Germany
We inspect the interplay between spin fluctuations and the local Coulomb repulsion in strongly correlated two dimensional systems using the Hubbard model. By employing a state-of-the-art extended dynamical mean field theory (EDMFT) that incorporates the non-local interaction in the conventional single site dynamical mean field theory (DMFT), the single particle spectral function, the dynamical spin susceptibility and two particle quantities are calculated. It is shown that the inclusion of spin fluctuation assists the formation of pseudogap in the single particle spectral function. Similarly, the particle-particle sector also shows a reduction of the spectral weight as the spin exchange interaction increases.