One-Particle Anomalous Excitations of Gutzwiller Projected BCS Superconductors and Bogoliubov Quasi-Particle Characteristics

Abstract

Low-lying one-particle anomalous excitations are studied for Gutzwiller projected strongly correlated BCS states. It is found that the one-particle anomalous excitations are highly coherent, and the numerically calculated spectrum can be reproduced quantitatively by a renormalized BCS theory, thus strongly indicating that the nature of low-lying excitations described by the projected BCS states is essentially understood within a renormalized Bogoliubov quasi-particle picture. This finding resembles a well known fact that a Gutzwiller projected Fermi gas is a Fermi liquid. The present results are consistent with numerically exact calculations of the two-dimensional t-J model as well as recent photoemission experiments on high-T_{\rm C} cuprate superconductors.

5 pages, 3 figures, accepted for publication in Phys. Rev. B 74, 180504(R) (2006)

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• Realistic estimates of superconducting properties for the cuprates: reciprocal-space diagrammatic expansion combined with variational approach
• Grand-canonical variational approach for the t-J model
• SU(2) approach to the pseudogap phase of high-temperature superconductors: electronic spectral functions
• Breakdown of Landau Fermi liquid theory: restrictions on the degrees of freedom of quantum electrons
• Low-lying quasiparticle excitations in strongly-correlated superconductors: An ansatz from BCS quasiparticle excitations?
• Tunnelling matrix elements with antiferromagnetic Gutzwiller wave functions
• Preparing the Gutzwiller wave function for attractive SU(3) fermions on a quantum computer