Finite compressibility in the low-doping region of the two-dimensional t-J model

@article{Lugas2006FiniteCI,
  title={Finite compressibility in the low-doping region of the two-dimensional t-J model},
  author={Massimo Lugas and Leonardo Spanu and Federico Becca and Sandro Sorella},
  journal={Physical Review B},
  year={2006},
  volume={74},
  pages={165122}
}
We reexamine the important issue of charge fluctuations in the two-dimensional $t\text{\ensuremath{-}}J$ model by using an improved variational method based on a wave function that contains both antiferromagnetic and $d$-wave superconducting order parameters. In particular, we generalize the wave function introduced some time ago by Bouchaud, Georges, and Lhuillier [J. Phys. (Paris) 49, 553 (1988)] by considering also a long-range spin-spin Jastrow factor, in order to correctly reproduce the… 
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