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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.43: Poster

Thursday, March 29, 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.