SPECTRAL PROPERTIES OF THE PLANAR T-J MODEL

Results for the single-particle spectral function A((k) over bar,w) in the planar t - J model, obtained by the numerical finite-temperature method for small systems, are presented. At intermediate doping and at low temperatures spectra show strong asymmetry between the hole and e lectron part, and near the Fermi surface reveal the marginal Fermi-liq uid form. An analytical approach, based on the equations of motion for projected Green's functions and the decoupling approximation, reprodu ces reasonably these features.