Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 62: CE: Low-dimensional Systems - Models 2
TT 62.3: Vortrag
Freitag, 18. März 2011, 11:00–11:15, HSZ 105
Interaction-induced Fermi-surface renormalization in frustrated Hubbard models — •Luca F. Tocchio1, Federico Becca2, and Claudius Gros1 — 1Institute for Theoretical Physics, Frankfurt University, Max-von-Laue-Straße 1, D-60438 Frankfurt a.M., Germany — 2CNR-IOM-Democritos National Simulation Centre and International School for Advanced Studies (SISSA), Via Bonomea 265, I-34136, Trieste, Italy
We investigate the nature of the interaction-driven Mott-Hubbard transition for frustrated Hubbard models, using a variational Monte Carlo approach including a distance-dependent Jastrow factor and a novel-type of holon-doublon correlation, the so-called backflow correlations. They allow to treat the doublon-holon excitons correctly in the large-U limit and for an improved understanding of the Fermi-surface renormalization close to the Mott-Hubbard transition. Indeed, we find that the Fermi surface renormalizes to perfect nesting right at the Mott-Hubbard transition in the insulating state, with a first-order reorganization when crossing the transition into the metallic state. This result may potentially change our view of the Mott-Hubbard transition in finite dimensions, since it seems to be qualitatively different from its infinite-dimension analogon.