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Spin Gap and Superconductivity in the One-Dimensional t-J Model with Coulomb Repulsion

M. Troyer·H. Tsunetsugu·T. M. Rice·J. Riera·E. Dagotto
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Abstract

The one-dimensional t-J model with density-density repulsive interactions is investigated using exact diagonalization and quantum Monte Carlo methods. A short-range repulsion pushes phase separation to larger values of J/t, and leads to a widened precursor region in which a spin gap and strengthened superconducting correlations appear. The correlation exponent is calculated. On the contrary, a long-range repulsion of $1/r$-form suppresses superconductivity in the precursor region.

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M. Troyer, H. Tsunetsugu, T. M. Rice, J. Riera, E. Dagotto. 1992-12-23. Spin Gap and Superconductivity in the One-Dimensional t-J Model with Coulomb Repulsion. https://doi.org/10.1103/physrevb.48.4002

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