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- W2312760742 abstract "Magnetic structures of the two-dimensional Hubbard model on a uniform triangular lattice are investigated from the viewpoint of quantum fluctuations. First, possible spin density wave (SDW) solutions in the unrestricted Hartree-Fock approximation are group theoretically classified for the ordering vectors of ${mathbf{Q}}_{1}=({mathbf{G}}_{a}+{mathbf{G}}_{b})/4$, ${mathbf{Q}}_{2}={C}_{3}^{+}{mathbf{Q}}_{1}$, and ${mathbf{Q}}_{3}={C}_{3}^{ensuremath{-}}{mathbf{Q}}_{1}$. Then, to include the electron correlation effects efficiently, we apply the resonating Hartree-Fock method. It is shown that the spin fluctuations in the metallic ground state at $U/tensuremath{sim}4.5$ are reasonably described as hybridization of two different SDW states obtained by the group theoretical classification and their low-energy excited states. These fluctuations make the long-range magnetic order significantly reduced in the correlated ground state." @default.
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- W2312760742 date "2011-12-07" @default.
- W2312760742 modified "2023-10-18" @default.
- W2312760742 title "Group-theoretical and resonating Hartree-Fock studies for spin fluctuations in two-dimensional Hubbard model on triangular lattice" @default.
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- W2312760742 doi "https://doi.org/10.1103/physrevb.84.245101" @default.
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