Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-10-16
Phys. Rev. B 74, 180504(R) (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 3 figures, accepted for publication in Phys. Rev. B 74, 180504(R) (2006)
Scientific paper
10.1103/PhysRevB.74.180504
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.
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