Electron Momentum Distribution Function in the t-t'-J Model

2); 2) ((1) J. Stefan Institute; (2) Faculty of Mathematics; A. Ramsak (1; I. Sega (1); Ljubljana; Physics; P. Prelovsek (1; Slovenia; Slovenia)

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Electron Momentum Distribution Function in the t-t'-J Model

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arxiv cond-mat/9910419 v1 submitted 1999-10-26 cond-mat.str-el

A. Ramsak (1 , 2) , I. Sega (1) , P. Prelovsek (1 , 2) ((1) J. Stefan Institute , Ljubljana , Slovenia , (2) Faculty of Mathematics

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Physics University of Ljubljana Slovenia)

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keywords emdfmomentumdistributionelectronfunctionholemodelquantitatively

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We study the electron momentum distribution function (EMDF) for the two-dimensional t-t'-J model doped with one hole on finite clusters by the method of twisted boundary conditions. The results quantitatively agree with our analytical results for a single hole in the antiferromagnetic background, based on the self-consistent Born approximation (SCBA). Moreover, within the SCBA an anomalous momentum dependence of EMDF is found, pointing to an emerging large Fermi surface. The analysis shows that the presence of next-nearest-neighbor (NNN) hopping terms changes EMDF only quantitatively.

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