ELECTRON GREENS-FUNCTION IN THE PLANAR T-J-MODEL

The electron Green's functions G(k, w) within the t - J model and in t he regime of intermediate doping is studied analytically using equatio ns of motion for projected fermionic operators and the decoupling of t he self energy into the single-particle and spin fluctuations. It is s hown that the assumption of marginal spin dynamics at T = 0 leads to a n anomalous quasiparticle damping. Numerical results show also a prono unced asymmetry between the hole (w < 0) and the electron (w > 0) part of the spectral function, whereby hole-like quasiparticles are genera lly overdamped.