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Spin-Gap Phase in the One-Dimensional t-J-J' Model | | Masaaki Nakamura
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26 Dec 1997 | | Journal: | J. Phys. Soc. Jpn. 67 (1998) 717 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | 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 $J,J’ o 0$ 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 $K_{
ho}=1$ 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. | | Source: | arXiv, cond-mat/9801263 | | Services: | Forum | Review | PDF | Favorites | |
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