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Spectral weight function for the half-filled Hubbard model: a singular value decomposition approach

C. E. Creffield·E. G. Klepfish·E. R. Pike·Sarben Sarkar
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Abstract

The singular value decomposition technique is used to reconstruct the electronic spectral weight function for a half-filled Hubbard model with on-site repulsion $U=4t$ from Quantum Monte Carlo data. A two-band structure for the single-particle excitation spectrum is found to persist as the lattice size exceeds the spin-spin correlation length. The observed bands are flat in the vicinity of the $(0,π),(π,0)$ points in the Brillouin zone, in accordance with experimental data for high-temperature superconducting compounds.

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C. E. Creffield, E. G. Klepfish, E. R. Pike, Sarben Sarkar. 1995-01-25. Spectral weight function for the half-filled Hubbard model: a singular value decomposition approach. https://doi.org/10.1103/physrevlett.75.517

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