Phase separation in the 2D Hubbard model: a fixed-node quantum Monte Carlo study

Details Phase separation in the 2D Hubbard model: a fixed-node quantum Monte Carlo study Phase separation in the 2D Hubbard model: a fixed-node quantum Monte Carlo study

1998-01-28

arxiv.org/abs/cond-mat/9801299v4

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 1 figure; revised version, more data points

Scientific paper

10.1103/PhysRevB.58.R14685

Fixed-node Green's function Monte Carlo calculations have been performed for very large 16x6 2D Hubbard lattices, large interaction strengths U=10,20, and 40, and many (15-20) densities between empty and half filling. The nodes were fixed by a simple Slater-Gutzwiller trial wavefunction. For each value of U we obtained a sequence of ground-state energies which is consistent with the possibility of a phase separation close to half-filling, with a hole density in the hole-rich phase which is a decreasing function of U. The energies suffer, however, from a fixed-node bias: more accurate nodes are needed to confirm this picture. Our extensive numerical results and their test against size, shell, shape and boundary condition effects also suggest that phase separation is quite a delicate issue, on which simulations based on smaller lattices than considered here are unlikely to give reliable predictions.

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