SPECTRAL PROPERTIES OF THE PLANAR T-J MODEL

The single-particle spectral functions A(k,omega) and self-energies Si gma(k,omega) are calculated within the t-J model using the finite-temp erature Lanczos method for small systems. A remarkable asymmetry betwe en the electron and hole part is found. The hole (photoemission) spect ra are overdamped, with Im Sigma proportional to omega in a wide energ y range, consistent with the marginal Fermi liquid scenario, and in go od agreement with experiments on cuprates. In contrast, the quasiparti cles in the electron part of the spectrum show weak damping.