Creffield, Charles E.Klepfish,, E.G.Pike, E. R.Sarkar, Sarben2023-06-202023-06-201995-07-170031-900710.1103/PhysRevLett.75.517https://hdl.handle.net/20.500.14352/60125© 1995 The American Physical Society. We thank J. Jefferson, A. Bratkovsky, D. Edwards, D. Sivia, and P. Kornilovitch for stimulating discussions. This work was supported by SERC Grant NO. GR/JI8675 and our general development of SVD techniques by the U.S. Army Research ONce, Agreement No. DAAL03-92- G-0142.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, pi), (pi, 0) points in the Brillouin zone, in accordance with experimental data for high-temperature superconducting compounds.engjournal articlehttp://dx.doi.org/10.1103/PhysRevLett.75.517https://journals.aps.orgopen access538.9Exponential relaxation ratesLaplace transform InversionDilationally invariant transformsSystem-analysisSampling methodDiscrete-dataResolutionRecoveryFísica de materialesFísica del estado sólido2211 Física del Estado Sólido