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• W2136836195 abstract "It is well-known from unrestricted Hartree-Fock computations that the 2D Hubbard model does not have homogeneous mean field states in significant regions of parameter space away from half filling. This is incompatible with standard mean field theory. We present a simple extension of the mean field method that avoids this problem. As in standard mean field theory, we restrict Hartree-Fock theory to simple translation invariant states describing antiferromagnetism (AF), ferromagnetism (F) and paramagnetism (P), but we use an improved method to implement the doping constraint allowing us to detect when a phase separated state is energetically preferred, e.g. AF and F coexisting at the same time. We find that such mixed phases occur in significant parts of the phase diagrams, making them much richer than the ones from standard mean field theory. Our results for the 2D t-t'-U Hubbard model demonstrate the importance of band structure effects." @default.
• W2136836195 created "2016-06-24" @default.
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• W2136836195 date "2007-03-23" @default.
• W2136836195 modified "2023-10-03" @default.
• W2136836195 title "Mean Field Magnetic Phase Diagrams for the Two Dimensional t — t′ — U Hubbard Model" @default.
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• W2136836195 doi "https://doi.org/10.1007/s10955-007-9308-y" @default.
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