Mott transition and magnetism of the triangular-lattice Hubbard model with next-nearest-neighbor hopping
Mott transition and magnetism of the triangular-lattice Hubbard model with next-nearest-neighbor hopping
The variational cluster approximation is used to study the isotropic triangular-lattice Hubbard model at half filling, taking into account the nearest-neighbor ($t_1$) and next-nearest-neighbor ($t_2$) hopping parameters for magnetic frustrations. We determine the ground-state phase diagram of the model. In the strong correlation regime, the 120$^\circ$ N\'eel and stripe ordered …