Phase Separation in the Two-Dimensional Hubbard Model

Abstract

By making use of known exact results and symmetry properties for the one-band Hubbard model, we show in a somewhat exact manner that there is no phase separation on a square lattice at arbitrary fillings at finite temperature for both attractive and repulsive on-site Coulomb interaction. This result is consistent with the quantum Monto Carlo calculation.

4 pages, Revtex, no figure, Phys. Rev. B (Rapid Commun.)

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