title: Nagaoka ferromagnetism in the two-dimensional infinite-U Hubbard model.
abstract: We present different numerical calculations based on variational quantum Monte Carlo simulations supporting a ferromagnetic ground state for finite and small hole densities in the two-dimensional infinite-U Hubbard model. Moreover, by studying the energies of different total spin sectors, these calculations strongly suggest that the paramagnetic phase is unstable against a phase with a partial polarization for large hole densities delta approximately 0.40 with evidence for a second-order transition to the paramagnetic large doping phase.
authors.affiliation: Istituto Nazionale per la Fisica della Materia and International School for Advanced Studies, Via Beirut 4, 34013 Trieste, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Becca
authors.forename: S
authors.initials: S
authors.lastname: Sorella