Dresden 2011 – scientific programme
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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.