Regensburg 2010 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 27: CE: Poster Session

TT 27.37: Poster

Mittwoch, 24. März 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.