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 ${2\mathrm{k}}_{\mathrm{F}}$ fluctuations becomes more intense close to half filling. Comparing these results with exact-diagonalization data obtained on finite clusters for the finite-U 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≃10, J/t≃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.