Revisit phase separation of the two-dimensional t-J model by the power-Lanczos method Original Research Article

The power-Lanczos (PL) method is one kind of Greenʹs function Monte Carlo simulation, which is improved by Lanczos iterations. The ground state energies of strongly-correlated models can be evaluated by this method quite accurately. In this report, the boundary of phase separation (PS) of the two-dimensional t-J model is investigated by the power-Lanczos method and Maxwell construction. The energies are compared with the results evaluated by other methods. Our conclusion is that there is no phase separation for J/t≤0.4.