Charge-Density-Excitation Spectrum in the t-t'-J-V Model

  title={Charge-Density-Excitation Spectrum in the t-t'-J-V Model},
  author={Andr{\'e}s Greco and Hiroyuki Yamase and Mat{\'i}as Bejas},
We study the density-density correlation function in a large-N scheme of the t-t'-J-V model. When the nearest-neighbor Coulomb interaction V is zero, our model exhibits phase separation in a wide doping region and we obtain large spectral weight near momentum q=(0,0) at low energy, which originates from the proximity to phase separation. These features are much stronger for electron doping than for hole doping. However, once phase separation is suppressed by including a finite V, the low-energy… CONTINUE READING