The itinerant ferromagnetic phase of the Hubbard model
Abstract
Using a newly developed quantum Monte Carlo technique, we provide strong evidence for the stability of a saturated ferromagnetic phase in the high-density regime of the two-dimensional infinite-U Hubbard model. By decreasing the electron density, a discontinuous transition to a paramagnetic phase is observed, accompanied by a divergence of the susceptibility on the paramagnetic side. This behavior, resulting from a high degeneracy among different spin sectors, is consistent with an infinite-order phase transition. The remarkable stability of itinerant ferromagnetism renews the hope to describe this phenomenon within a purely kinetic mechanism and will facilitate the validation of experimental quantum simulators with cold atoms loaded in optical lattices.
Keywords
Cite
@article{arxiv.1007.4260,
title = {The itinerant ferromagnetic phase of the Hubbard model},
author = {Giuseppe Carleo and Saverio Moroni and Federico Becca and Stefano Baroni},
journal= {arXiv preprint arXiv:1007.4260},
year = {2011}
}