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TT: Fachverband Tiefe Temperaturen

TT 48: CE: Metal-Insulator Transition 2

TT 48.9: Talk

Thursday, March 17, 2011, 12:45–13:00, HSZ 105

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 für Theoretische Physik, Universität Hamburg, Jungiusstraße 9 — ²Centre de Physique Théorique (CPHT), École 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 compared results to CDMFT and DCA calculations.