Abstract
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 and 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 case with a small residual Neel moment. Quantum fluctuations are even stronger in the case. Numeric results are consistent with either a vanishing or even weaker Neel ordering than that of .
- Received 4 April 2013
DOI:https://doi.org/10.1103/PhysRevB.88.125108
©2013 American Physical Society