SPECTRAL FUNCTIONS OF ONE-DIMENSIONAL MODELS OF CORRELATED ELECTRONS

Using the Ogata-Shiba wave function, the spectral functions of the one -dimensional infinite-U Hubbard model are calculated for various conce ntrations. It is shown that the ''shadow-band'' feature due to 2k(F) f luctuations becomes more intense close to half filling. Comparing thes e results with exact-diagonalization data obtained on finite clusters for the finite-Li Hubbard model and for the t-J model, it is also show n that this feature remains well defined for physically reasonable val ues of the parameters (U/t similar or equal to 10, J/t similar or equa l to 0.4). The ''shadow'' structure in the spectral functions should t hus be observable in angle-resolved photoemission experiments for a va riety of quasi- one-dimensional compounds.