Hole pairs in a spin liquid: Influence of electrostatic hole-hole repulsion
نویسندگان
چکیده
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 2330 sites. For a nearest-neighbor ~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 ;10% hole doping the pairs break only for a NN repulsion as large as V;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. @S0163-1829~99!50902-8#
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