Spectral weight function for the half-filled hubbard-model - a singular-value decomposition approach
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 s...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 1995 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/60125 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/60125 |
| Access Level: | acceso abierto |
| Palabra clave: | 538.9 Exponential relaxation rates Laplace transform Inversion Dilationally invariant transforms System-analysis Sampling method Discrete-data Resolution Recovery Física de materiales Física del estado sólido 2211 Física del Estado Sólido |
| Sumario: | 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. |
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