SPECTRAL PROPERTIES OF LUTHER-EMERY SYSTEMS

We construct the spectral function of the Luther-Emery model which des cribes one-dimensional fermions with gapless charge and gapped spin de grees of freedom. We find a true singularity with interaction dependen t exponents on the gapped spin dispersion and a finite maximum dependi ng on the magnitude of the spin gap on a shifted charge dispersion. We apply these results to photoemission experiments on charge density wa ve systems and discuss the spectral properties of a one-dimensional Mo tt insulator.