Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/21634
Título: | Charge dynamics in half-filled hubbard chains with finite on-site interaction |
Autor(es): | Carmelo, José Manuel Pereira Pereira, R. G. Penc, K. Sacramento, Pedro D. |
Palavras-chave: | Charge dynamics in half-filled hubbard chains |
Data: | 20-Abr-2012 |
Editora: | American Physical Society |
Revista: | Physical Review B: Condensed Matter and Materials Physics |
Citação: | Physical Review B: Condensed Matter and Materials Physics, 85, 165132 (2012) |
Resumo(s): | We study the charge dynamic structure factor of the one-dimensional Hubbard model with finite on-site repulsion U at half-filling. Numerical results from the time-dependent density matrix renormalization group are analyzed by comparison with the exact spectrum of the model. The evolution of the line shape as a function of U is explained in terms of a relative transfer of spectral weight between the two-holon continuum that dominates in the limit U →∞ and a subset of the two-holon-two-spinon continuum that reconstructs the electron-hole continuum in the limit U → 0. Power-law singularities along boundary lines of the spectrum are described by effective impurity models that are explicitly invariant under spin and η-spin SU(2) rotations. The Mott-Hubbard metal-insulator transition is reflected in a discontinuous change of the exponents of edge singularities at U = 0. The sharp feature observed in the spectrum for momenta near the zone boundary is attributed to a van Hove singularity that persists as a consequence of integrability. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/21634 |
DOI: | 10.1103/PhysRevB.85.165132 |
ISSN: | 1098-0121 |
e-ISSN: | 1550-235X |
Versão da editora: | http://prb.aps.org/ |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | CDF - CEP - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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12-DSF-n1.pdf Acesso restrito! | 1,03 MB | Adobe PDF | Ver/Abrir |