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• W2035041395 abstract "We present a symmetry-projected configuration mixing scheme to describe ground and excited states, with well defined quantum numbers, of the two-dimensional Hubbard model with nearest-neighbor hopping and periodic boundary conditions. Results for the half-filled $2ifmmodetimeselsetexttimesfi{}4$, $4ifmmodetimeselsetexttimesfi{}4$, and $6ifmmodetimeselsetexttimesfi{}6$ lattices as well as doped $4ifmmodetimeselsetexttimesfi{}4$ systems, compare well with available results, both exact and from other state-of-the-art approximations. We report spectral functions and density of states obtained from a well-controlled ansatz for the $({N}_{e}ifmmodepmelsetextpmfi{}1)$-electron system. Symmetry projected methods have been widely used for the many-body nuclear physics problem but have received little attention in the solid state community. Given their relatively low (mean-field) computational cost and the high quality of results here reported, we believe that they deserve further scrutiny." @default.
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• W2035041395 date "2012-06-26" @default.
• W2035041395 modified "2023-09-27" @default.
• W2035041395 title "Symmetry-projected variational approach for ground and excited states of the two-dimensional Hubbard model" @default.
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• W2035041395 doi "https://doi.org/10.1103/physrevb.85.245130" @default.
• W2035041395 hasPublicationYear "2012" @default.
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