NON-FERMI LIQUID BEHAVIOR IN A MEAN-FIELD STUDY OF THE T-J MODEL - ROLE OF ZERO-POINT SPIN FLUCTUATIONS

We present analytic results to show that the Schwinger-boson hole-ferm ion mean-field state exhibits non-Fermi liquid behavior due to spin-ch arge separation. The physical electron Green's function consists of th ree additive components. (a) A Fermi-liquid component associated with the bose condensate. (b) A non-Fermi liquid component which has a loga rithmic peak and a long tail that gives rise to a linear density of st ates that is symmetric about the Fermi level and a momentum distributi on function with a logarithmic discontinuity at the Fermi surface. (c) A second non-Fermi liquid component associated with the thermal boson s which leads to a constant density of states. It is shown that zero-p oint fluctuations associated with the spin-degrees of freedom are resp onsible for the logarithmic instabilities and the restoration of parti cle-hole symmetry close to the Fermi surface.