Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 10: Correlated Electrons: (General) Theory 1
TT 10.4: Vortrag
Montag, 26. März 2012, 15:45–16:00, H 3010
Electronic correlation at the two-particle level — •Thomas Schaefer1, Georg Rohringer1, Alessandro Toschi1, Giorgio Sangiovanni1, Olle Gunnarsson2, and Karsten Held1 — 1Institute for Solid State Physics, Vienna University of Technology, Austria — 2Max-Planck-Institute for Solid State Research, Stuttgart, Germany
Electronic correlated systems can often be successfully described by dynamical mean field theory (DMFT). If DMFT is applied to finite-dimensional systems it is self-consistent at the one-particle level.
Extensions of DMFT based upon the systems’ two-particle properties have been developed such as the dynamical vertex approximation (DΓA) [1] or the dual fermion approach [2].
In addition, the understanding and the calculation of two-particle quantities are crucial within DMFT to compute momentum-dependent response functions that can be compared directly with experiments.
As hitherto the investigation of local and non-local two-particle properties has been merely sporadic, we provide a systematic analysis of the reducible and irreducible two-particle vertex functions by applying DMFT and the dynamical cluster approximation (DCA) to the two-dimensional Hubbard model.
A. Toschi, A. A. Katanin, and K. Held, Phys. Rev. B 75, 045118 (2007).
A. N. Rubtsov, M. I. Katsnelson, and A. I. Lichtenstein, Phys. Rev. B 77, 033101 (2008).