One-electron singular branch lines of the Hubbard chainJ. M. P. Carmelo1, K. Penc2, L. M. Martelo1, 3, P. D. Sacramento4, J. M. B. Lopes dos Santos5, R. Claessen6, M. Sing6 and U. Schwingenschlögl6
1 GCEP-Center of Physics, U. Minho, Campus Gualtar - P-4710-057 Braga, Portugal
2 Research Institute for Solid State Physics and Optics H-1525 Budapest, P.O.B. 49, Hungary
3 Physics Department, Engineering Faculty of U. Porto - P-4200-465 Porto, Portugal
4 CFIF, Instituto Superior Técnico - Av. Rovisco Pais, 1049-001 Lisboa, Portugal
5 CFP and Departamento de Física FC U. Porto - P-4169-007 Porto, Portugal
6 Experimentalphysik II, Universität Augsburg - D-86135 Augsburg, Germany
(Received 5 January 2004; accepted in final form 7 May 2004)
The momentum and energy dependence of the weight distribution in the vicinity of the one-electron spectral-function singular branch lines of the 1D Hubbard model is studied for all values of the electronic density and on-site repulsion U. To achieve this goal, we use the recently introduced pseudofermion dynamical theory. Our predictions agree quantitatively for the whole momentum and energy bandwidth with the peak dispersions observed by angle-resolved photoelectron spectroscopy in the quasi-1D organic conductor TTF-TCNQ.
71.10.Pm - Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.).
71.27.+a - Strongly correlated electron systems; heavy fermions.
© EDP Sciences 2004