Bogoliubov quasiparticle spectra of the effective d-wave model for cuprate superconductivity

Abstract

An exact-diagonalization technique on finite-size clusters is used to study the ground state and excitation spectra of the two-dimensional effective fermion model, a fictious model of hole quasiparticles derived from numerical studies of the two-dimensional t-J model at low doping. We show that there is actually a reasonable range of parameter values where the $d_{x^2-y^2}$-wave pairing of holes occurs and the low-lying excitation can be described by the picture of Bogoliubov quasiparticles in the BCS pairing theory. The gap parameter of a size ${\Delta }_d\simeq 0.13|V|$ (where $V$ is the attractive interaction between holes) is estimated at low doping levels. The paired state gives way to the state of clustering of holes for some stronger attractions.

4 pages, RevTeX. Figures available upon request to [email protected]. To be published in Phys. Rev. B

References in corpus (5)

• Correlated Electrons in High Temperature Superconductors
• Antiferromagnetic and van Hove Scenarios for the Cuprates: Taking the Best of Both Worlds
• Bogoliubov Quasiparticle Excitations in the Two-Dimensional t-J Model
• Anomalous Spin and Charge Dynamics of the 2D t-J Model at low doping
• Validity of the rigid band picture for the t-J model