Hole pairs in a spin liquid: Influence of electrostatic hole-hole repulsion

Article

关键词: HIGH-TEMPERATURE SUPERCONDUCTORS;    T-J LADDERS;    CORRELATED ELECTRONS;    J MODEL;    DENSITY;    ANTIFERROMAGNET;    LA2CUO4;   

DOI  :  10.1103/PhysRevB.59.R709

来源: SCIE

【 摘 要 】

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 2x30 sites. Far 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 similar to 10% hole doping the pairs break only for a NN repulsion as large as V similar to 4J. Pair-pail 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].

【 授权许可】

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