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 concentrations. It is shown that the ''shadow-band'' feature due to 2k(F) fluctuations becomes more intense close to half filling. Comparing these results with exact-diagonalization data obtained on finite clusters for the finite-Li Hubbard model and for the t-J model, it is also shown that this feature remains well defined for physically reasonable values of the parameters (U/t similar or equal to 10, J/t similar or equal to 0.4). The ''shadow'' structure in the spectral functions should thus be observable in angle-resolved photoemission experiments for a variety of quasi- one-dimensional compounds.