Spectral function and quasiparticle weight in the generalized t-J model
Abstract
We extend to the spectral function an approach which allowed us to calculate the quasiparticle weight for destruction of a real electron Z_c sigma (k) (in contrast to that of creation of a spinless holon Z_h(k) in a generalized model, using the self-consistent Born approximation (SCBA). We compare our results with those obtained using the alternative approach of Sushkov et al., which also uses the SCBA. The results for Z_c sigma (k) are also compared with results obtained using the string picture and with exact diagonalizations of a 32-site square cluster. While on a qualitative level, all results look similar, our SCBA approach seems to compare better with the ED one. The effect of hopping beyond nearest neighbors, and that of the three-site term are discussed.
Cite
@article{arxiv.cond-mat/9809381,
title = {Spectral function and quasiparticle weight in the generalized t-J model},
author = {F. Lema and A. A. Aligia},
journal= {arXiv preprint arXiv:cond-mat/9809381},
year = {2009}
}
Comments
7 pages, 6 figures