Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 45: Correlated Electrons: Poster Session
TT 45.43: Poster
Donnerstag, 29. März 2012, 15:00–19:00, Poster B
Long range order effects in the Mott-Hubbard transition and the Variational Lattice Approach — •Aljoscha Wilhelm1, Christoph Jung1, Hartmut Hafermann2, and Alexander Lichtenstein1 — 1I. Institut fur Theoretische Physik, Universitat Hamburg, Jungiusstrae 9 — 2Centre de Physique Theorique (CPHT), Ecole Polytechnique, 91128 Palaiseau Cedex, France
We introduce an efficient strategy to treat long ranged correlations in fermionic lattices, the so called variational lattice approach (VLA). The VLA combines the recently developed dual fermion approach for k-dependent problems and the exact diagonalization technique. We present first benchmark results. The phase diagram of the half-filled paramagnetic Mott-Hubbard transition is discussed and results are compared to CDMFT and DCA calculations.