BOGOLIUBOV QUASI-PARTICLE EXCITATIONS IN THE 2-DIMENSIONAL T-J MODEL

Using a proposed numerical technique for calculating anomalous Green's functions characteristic of superconductivity, we show that the low-l ying excitations in a wide parameter and doping region of the two-dime nsional t-J model are well described by the picture of dressed Bogoliu bov quasiparticles in the BCS pairing theory. The pairing occurs predo minantly in the dx2-y2-wave channel and the energy gap has a size DELT Ad congruent-to 15J-0.27J between quarter and half fillings. Opening o f the superconducting gap in the photoemission and inverse-photoemissi on spectra is demonstrated.