In the two-dimensional extended Hubbard model, the charge susceptibility obeys an RPA-like formula built from the U'=0 polarization, because the density fermion-boson coupling is nearly independent of U'.
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Screening and effective RPA-like charge susceptibility in the extended Hubbard model
In the two-dimensional extended Hubbard model, the charge susceptibility obeys an RPA-like formula built from the U'=0 polarization, because the density fermion-boson coupling is nearly independent of U'.