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

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

1998-03-26

arxiv.org/abs/cond-mat/9803314v2

Phys.Rev. B 59, R709 (1999)

Physics

Condensed Matter

Revised version with new figures. 4 pages, 5 figures

Scientific paper

10.1103/PhysRevB.59.R709

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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