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Phys. Rev. B 59, R709–R712 (1999)

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

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Claudio Gazza and George B. Martins
National High Magnetic Field Laboratory and Department of Physics, Florida State University, Tallahassee, Florida 32306

José Riera*
Laboratoire de Physique Quantique, Unité mixte 10 de Recherche, CNRS 5626, Université Paul Sabatier, 11 31062 Toulouse, France

Elbio Dagotto
National High Magnetic Field Laboratory and Department of Physics, Florida State University, Tallahassee, Florida 32306

Received 18 September 1998; published in the issue dated 1 January 1999

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 2×30 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.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.59.R709
DOI:
10.1103/PhysRevB.59.R709
PACS:
74.20.-z, 74.20.Mn, 74.25.Dw

*Permanent address: Inst. de Física Rosario, Univ. Nac. de Rosario, Av. Pellegrini 250, 2000-Rosario, Argentina.

 
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