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TT: Fachverband Tiefe Temperaturen

TT 16: Correlated Electrons: Low-dimensional Systems - Models 2

TT 16.7: Vortrag

Dienstag, 27. März 2012, 11:00–11:15, H 0104

A New View of the Mott-Hubbard Transition: Renormalization of the Fermi-Surface Topology — •Luca Fausto Tocchio¹, Federico Becca², and Claudius Gros¹ — ¹Institute of Theoretical Physics, Goethe University, Frankfurt am Main, Germany — ²International School for Advanced Studies (SISSA), Trieste, Italy

We present the renormalization of the (underlying) Fermi-surface topology in the Hubbard model on a square lattice with frustrating hopping, that is relevant for the physics of high-temperature superconductors. With the help of novel high precision variational tools, including Jastrow factors and backflow correlations, we show that the Fermi surface renormalizes to perfect nesting at the interaction-driven Mott-Hubbard transition and in the large interaction limit. Moreover, we present new results for the density-driven Mott-Hubbard transition, investigating the Fermi-surface renormalization flow as a function of doping, where the renormalization occurs only when the half-filled case is insulating. Finally, we show also that Fermi surface renormalization is associated to a strong crossover at finite doping for the critical U corresponding to the Mott-Hubbard transition.