Bogoliubov Quasiparticle Excitations in the Two-Dimensional t-J Model

Y. Ohta; T. Shimozato; R. Eder; S. Maekawa

doi:10.1103/PhysRevLett.73.324

paper

Bogoliubov Quasiparticle Excitations in the Two-Dimensional t-J Model

arXiv:cond-mat/9403076 · doi:10.1103/PhysRevLett.73.324

Abstract

Using a proposed numerical technique for calculating anomalous Green's functions characteristic of superconductivity, we show that the low-lying excitations in a wide parameter and doping region of the two-dimensional $t$ $-$ $J$ model are well described by the picture of dressed Bogoliubov quasiparticles in the BCS pairing theory. The pairing occurs predominantly in $d_{x^{2} - y^{2}}$ -wave channel and the energy gap has a size $Δ_{d}$ $≃$ $0.15 J$ $- 0.27 J$ between quarter and half fillings. Opening of the superconducting gap in the photoemission and inverse-photoemission spectrum is demonstrated.

6 pages, RevTeX