Electronic structure of stripes in two-dimensional Hubbard model

Focusing on La_2-xSr_xCuO₄, we study the stripe structure by the self-consistent mean-field theory of the Hubbard model. By introducing the realistic Fermi surface topology, the SDW-gapped insulator is changed to metallic. The solitonic features of the stripe structure and the contribution of the mid-gap states are presented. We consider the band dispersion, the local density of states, the spectral weight, and the optical conductivity, associated with the solitonic structure. These results may provide important information for the experimental research of the stripe structure, such as the angle-resolved photoemission experiments. The "Fermi surface" shape is changed depending on the ratio of the incommensurability δ and the hole density n_h. In real space, only the stripe region is metallic when δ/n_h is large.