Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 27: CE: Poster Session
TT 27.37: Poster
Wednesday, March 24, 2010, 14:00–18:00, Poster D1
Variational Monte Carlo study of the one-dimensional t−t′ Hubbard model — •Luca F. Tocchio1, Claudius Gros1, and Federico Becca2 — 1Institute for Theoretical Physics, Goethe-University Frankfurt, Max-von-Laue-Straße 1, D-60438 Frankfurt am Main, Germany — 2CNR-INFM-Democritos National Simulation Centre and International School for Advanced Studies (SISSA), Via Beirut 2, I-34151 Trieste, Italy
We present a Variational Monte Carlo study of the one-dimensional Hubbard model with nearest and next-nearest neighbour hopping. After settling the metal-insulator transition, we describe the spin properties of the model, studying their behaviour across the metal-insulator transition and inside the insulating phase. The spin properties are then shown to be related to the single-particle spectrum in the optimized variational wave function. Moreover, we find that the metal-insulator transition can be already characterized at a mean-field level, since the underlying Fermi surface renormalizes to perfect nesting at the transition.