Quantum Phase Transitions in the Hubbard Model on a Triangular Lattice
Quantum Phase Transitions in the Hubbard Model on a Triangular Lattice
We investigate the quantum phase transitions in the half-filled Hubbard model on the triangular lattice by means of the path-integral renormalization group method with a new iteration and truncation scheme proposed recently. It is found for a cluster of 36 sites that as the Hubbard interaction U increases, the paramagnetic …