Slave-Fermion Mean Field Theory of the Hubbard Model
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Square lattice Hubbard model is investigated near half-filled in the limit of large U. A slave-fermion scheme is used, where electron operators are replaced by bose operators with auxiliary fermi operators. The ground state by a mean field approximation with RVB order parameter for spin shows long-range antiferromagnetic order, which is incommensurate except for half-filled case.
KeywordsHubbard Model Hole Concentration Heisenberg Model Bose Condensation Monte Carlo Data
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- F.C.Zhang and T.M.Rice, Phys. Rev. B 37, 3759 (1988).Google Scholar