Bogoliubov-quasiparticle spectra of the effective d-wave model for cuprate superconductivity
Y. Ohta, M. Yamaguchi, R. Eder
DOI 10.1103/PhysRevB.56.11262 · Physical Review B
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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 dx2−y2-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 Δd≃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.
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