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Hole-Pairs in a Spin Liquid: Influence of Electrostatic Hole-Hole Repulsion

C. Gazza·G. Martins·J. Riera·E. Dagotto
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Abstract

The stability of hole bound states in the t-J model including short-range Coulomb interactions is analyzed using computational techniques on ladders with up to $2 \times 30$ sites. For a nearest-neighbors (NN) hole-hole repulsion, the two-holes bound state is surprisingly robust and breaks only when the repulsion is several times the exchange $J$. At $\sim 10%$ hole doping the pairs break only for a NN-repulsion as large as $V \sim 4J$. Pair-pair correlations remain robust in the regime of hole binding. The results support electronic hole-pairing mechanisms on ladders based on holes moving in spin-liquid backgrounds. Implications in two dimensions are also presented. The need for better estimations of the range and strength of the Coulomb interaction in copper-oxides is remarked.

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C. Gazza, G. Martins, J. Riera, E. Dagotto. 1999-03-03. Hole-Pairs in a Spin Liquid: Influence of Electrostatic Hole-Hole Repulsion. https://doi.org/10.1103/physrevb.59.r709

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