Frequency-dependent spin susceptibility in the two-dimensional Hubbard model
A Quantum Monte Carlo calculation of dynamical spin susceptibility in the half-filled 2D Hubbard model is presented for temperature T = 0.2t and an intermediate on-site repulsion U = 4t. Using the singular value decomposition technique we succeed in analytically continuing the Matsubara Green’s func...
| Autores: | , , , , |
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| Tipo de documento: | artigo |
| Data de publicação: | 1997 |
| País: | España |
| Recursos: | Universidad Complutense de Madrid (UCM) |
| Repositório: | Docta Complutense |
| Idioma: | inglês |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/59756 |
| Acesso em linha: | https://hdl.handle.net/20.500.14352/59756 |
| Access Level: | Acceso aberto |
| Palavra-chave: | 538.9 High-Tc superconductivity Spectral weight function Monte-Carlo Fluctuations Metals Física de materiales Física del estado sólido 2211 Física del Estado Sólido |
| Resumo: | A Quantum Monte Carlo calculation of dynamical spin susceptibility in the half-filled 2D Hubbard model is presented for temperature T = 0.2t and an intermediate on-site repulsion U = 4t. Using the singular value decomposition technique we succeed in analytically continuing the Matsubara Green’s function into the real frequency domain and in deriving the spectral representation for the longitudinal and transverse spin susceptibility. The simulation results, while contradicting the random-phase approximation prediction of antiferromagnetic long-range order at this temperature, are in agreement with an extension of a self-consistent renormalization approach of Moriya. The static susceptibility calculated using this technique is qualitatively consistent with the ω → 0 simulation results. |
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