1305.3571 (Da Wang et al.)

Competing orders in the 2D half-filled SU(2N) Hubbard model through the
pinning field quantum Monte-Carlo simulations    [PDF]

Da Wang, Yi Li, Zi Cai, Congjun Wu

We investigate the ground state magnetic properties of the 2D half-filled SU(2N) Hubbard model in the square lattice by the determinant quantum Monte-Carlo simulations combined with the method of local pinning fields. This method directly gives rise to the values of order parameters instead of their magnitude square, thus it is more accurate at weak orderings than methods using correlation functions. Antiferromagnetic long-range orders are found for both the SU(4) and SU(6) cases at small and intermediate values of $U$. As increasing $U$, the long-range Neel moments first grow and then drop. This is very different from the SU(2) case in which the Neel moments increase monotonically and saturate. In the SU(6) case, a transition to the columnar dimer state is found in the strong interaction regime.

View original: http://arxiv.org/abs/1305.3571