Spectral Functions of One-Dimensional Electron Systems with Ising-Like Spin Gap

抄録

The effect of a spin gap on the photoemission spectral functions is studied in the one-dimensional t-J_XXZ model. We find that spinon bands show up in the spectral functions but holon bands are obscured in the spin-gap cases. The reason for this is studied using a simple interpretation of the spectral functions, which is a convolution between the spectral function of spinless fermions and a spin excitation weight Z(Q). The spin gap suppresses the singularity of Z(Q), and as a result, only the holon bands are obscured. It is also shown that the spinon peaks lie along a cosine band and extend over the region |k|>k_F. Finally, the momentum-dependent critical exponents of the power-law singularity at the spinon bands are determined.