Spin-Gap Phase in the One-Dimensional t-J-J' Model
Abstract
The spin-gap phase of the one-dimensional t-J-J' model is studied by the level-crossing of the singlet and the triplet excitation spectra. The phase boundary obtained between the Tomonaga-Luttinger and the spin-gap phases is remarkably consistent with the analytical results at the and the low-density limits discussed by Ogata et al. The spin-gap phase has a single domain in the phase diagram even if the spin gap opens at half-filling. The phase boundary coincides with the line where the Tomonaga-Luttinger liquid behaves as free electrons, in the low-density region. The relation between our method and the solution of the two-electron problem is also discussed.
Keywords
Cite
@article{arxiv.cond-mat/9801263,
title = {Spin-Gap Phase in the One-Dimensional t-J-J' Model},
author = {Masaaki Nakamura},
journal= {arXiv preprint arXiv:cond-mat/9801263},
year = {2009}
}
Comments
4 pages(JPSJ.sty), 5 figures(EPS), to appear in J. Phys. Soc. Jpn. 67, No.3 (1998)