Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 28: CE: (General) Theory 2

TT 28.3: Vortrag

Dienstag, 15. März 2011, 14:30–14:45, HSZ 105

Calculation of dynamical susceptibilities in the 2d Hubbard model: A dynamical cluster approximation study — •David J. Luitz and Fakher F. Assaad — Institut für Theoretische Physik und Astrophysik, Universität Würzburg

We calculate dynamical susceptibilities of the 2d Hubbard model within the dynamical cluster approximation (DCA). We use the weak coupling continuous time quantum Monte Carlo method which allows the unbiased calculation of the two particle irreducible vertex Γ on the cluster by virtue of the Bethe Salpeter equation. Γ is identified with the coarse grained vertex of the lattice thus yielding dynamical susceptibilities of the lattice within DCA. We will discuss technical details of the approach and present preliminary results of the dynamical spin susceptibility.