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arXiv:cond-mat/9709257 · Journal of Physics and Chemistry of Solids

A NUMERICAL AND ANALYTICAL STUDY OF TWO HOLES DOPED INTO THE 2D t–J MODEL

A.L Chernyshev, P. W. Leung, R.J Gooding

Published Oct 1, 1998• 3 citations
arXivHTMLPDF
DOI
10.1016/s0022-3697(98)00112-7

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We solve the t-J model with four holes on a 32-site lattice using exact diagonalization. This is the largest scale calculation ever reported for this model. The size of the matrix involved in this problem is about 3×109 by 3×109. We find that at the realistic parameter J/t = 0.3, holes in the ground state of this system are unbound. They have short range repulsion due to lowering of kinetic energy. The electron momentum distribution function resembles hole pockets. We show that in case antiferromagnetic order is strong, holes form d-wave bound pairs and there is mutual repulsion among the holes. This presumably will occur at low doping level.

International Journal of Modern Physics B•Jul 30, 2007•1 citation
Dynamics of a single hole in the t−Jt-Jt−J model
We solve the t-J model with four holes on a 32-site lattice using exact diagonalization. This is the largest scale calculation ever reported for this model. The size of the matrix involved in this problem is about 3×109 by 3×109. We find that at the realistic parameter J/t = 0.3, holes in the ground state of this system are unbound. They have short range repulsion due to lowering of kinetic energy. The electron momentum distribution function resembles hole pockets. We show that in case antiferromagnetic order is strong, holes form d-wave bound pairs and there is mutual repulsion among the holes. This presumably will occur at low doping level.