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

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

1999-10-26

arxiv.org/abs/cond-mat/9910419v1

Physica B, 284-288 (2000) 1400

Physics

Condensed Matter

Strongly Correlated Electrons

LT22 - submitted to Physica B

Scientific paper

10.1016/S0921-4526(99)02563-6

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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