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 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 points in the Brillouin zone, in accordance with experimental data for high-temperature superconducting compounds.
- Received 19 January 1995
DOI:https://doi.org/10.1103/PhysRevLett.75.517
©1995 American Physical Society