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Physics Letters A

The magnetic field dependence of the magnetization of the SU(4) and SU(6) Kondo models

Alex C. Hewson, J. W. Rasul, Dennis M. Newns

Published Jan 1, 1983• 30 citations
Publisher
DOI
10.1016/0375-9601(83)90797-1

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We employ the determinant projector quantum Monte Carlo method to investigate the ground-state magnetic properties in the Mott insulating states of the half-filled SU(4)SU(4)SU(4) and SU(6)SU(6)SU(6) Fermi-Hubbard model in the two-dimensional square lattice, which is free of the sign problem. The long-range antiferromagnetic Neel order is found for the SU(4)SU(4)SU(4) case with a small residual Neel moment. Quantum fluctuations are even stronger in the SU(6)SU(6)SU(6) case. Numeric results are consistent with either a vanishing or even weaker Neel ordering than that of SU(4)SU(4)SU(4).