Nanograin ferromagnets from non-magnetic bulk materials: the case of gold nanoclusters
arXiv:2109.07297 · doi:10.1142/S0217979221501484
Abstract
The ferromagnetism of Au nanograins is analysed based on a two-dimensional itinerant lattice model with on-site Coulomb repulsion, many-body spin-orbit interactions, and holding two hybridized bands, one correlated and one uncorrelated. Using periodic boundary conditions in both directions, an exact ferromagnetic ground state is deduced for this non-integrable system by applying special techniques based on positive semidefinite operators.
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