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 similar to 0.40 with evidence for a second-order transition to the paramagnetic large doping phase.
Nagaoka ferromagnetism in the two-dimensional infinite-U Hubbard model
Becca F;
2001-01-01
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 similar to 0.40 with evidence for a second-order transition to the paramagnetic large doping phase.File in questo prodotto:
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