1998/01/21 by Takami Tohyama, Sadamichi Maekawa
Physics and Astronomy · #Black Holes and Theoretical Physics #Physics of Superconductivity and Magnetism #Quantum Chromodynamics and Particle Interactions #cond-mat.str-el
paper · pdf · doi:10.1016/s0022-3697(98)00126-7
3 pages, 4 figures, LaTeX, Proceedings of the International Conference on Spectroscopy of Novel Superconductors. To be published in Journal of Phys. and Chem. of Solids
arxiv created 1998/01/21 · openalex publication_date 1998/10/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
We examine the effect of spin gap on single-hole spectral function in the one-dimensional t-J-J'model. At J'/J=1/2, where a dimer state is the ground state, an analytic expression is derived for J/t → 0. At finite values of J/t, the numerical diagonalizations for finite-size clusters are performed. In contrast to the gapless case, we find that (i) the dispersion becomes symmetric around k=π/2, (ii) the singularity of the holon band is strongly suppressed, and (iii) the quasi-particle weight Zh becomes finite at finite J/t. The feature (iii) is related to the presence of a bound state of the doped hole and an unpaired spin.