One-electron singular spectral features of the 1D Hubbard model at finite magnetic field

• Autor(a) principal: Carmelo, José Manuel Pereira
• Data de Publicação: 2017
• Outros Autores: Cadez, T.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/1822/49710
• topic: One-electron spectral function in a magnetic field; Ciências Naturais::Ciências Físicas; Science & Technology

The momentum, electronic density, spin density, and interaction dependences of the exponents that con-trol the (k, ω)-plane singular features of the σ=↑, ↓one-electron spectral functions of the 1D Hubbard model at finite magnetic field are studied. The usual half-filling concepts of one-electron lower Hubbard band and upper Hubbard band are defined in terms of the rotated electrons associated with the model Bethe-ansatz solution for all electronic density and spin density values and the whole finite repulsion range. Such rotated electrons are the link of the non-perturbative relation between the electrons and the pseudofermions. Our results further clarify the microscopic processes through which the pseudofermion dynamical theory accounts for the one-electron matrix elements between the ground state and excited energy eigenstates.