Momentum dependence of quasiparticle spectrum and Bogoliubov angle in cuprate superconductors

Details Momentum dependence of quasiparticle spectrum and Bogoliubov angle in cuprate superconductors Momentum dependence of quasiparticle spectrum and Bogoliubov angle in cuprate superconductors

2009-07-23

arxiv.org/abs/0907.4030v2

Phys. Lett. A 374, 632 (2010)

Physics

Condensed Matter

Superconductivity

6 pages, 5 figures, added figure and discussions, accepted for publication in Physics Letters A

Scientific paper

10.1016/j.physleta.2009.11.036

The momentum dependence of the low energy quasiparticle spectrum and the related Bogoliubov angle in cuprate superconductors are studied within the kinetic energy driven superconducting mechanism. By calculation of the ratio of the low energy quasiparticle spectra at positive and negative energies, it is shown that the Bogoliubov angle increase monotonically across the Fermi crossing point. The results also show that the superconducting coherence of the low energy quasiparticle peak is well described by a simple d-wave Bardeen-Cooper-Schrieffer formalism, although the pairing mechanism is driven by the kinetic energy by exchanging spin excitations.

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