Abstract
Results for the single-particle spectral function A( k, ω) 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 electron part, and near the Fermi surface reveal the marginal Fermi-liquid form. An analytical approach, based on the equations of motion for projected Green's functions and the decoupling approximation, reproduces reasonably these features.
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