Spectral properties and pseudogaps in a model with d-wave pairing symmetry

Abstract

A model with d-wave pairing symmetry is studied by employing a non-perturbative sum rule approach. At low temperature the magnitude of a normal state pseudogap shows strong $\vec{k}$ or angle dependence well fitted by $\cos 2\varphi$ form. With increasing temperature, the pseudogap closes at some critical angle ${\varphi }_c$ and beyond this angle a single quasiparticle-like peak appears. The resulting Fermi surface is strongly temperature dependent. Both in the spectral function and the density of states, the pseudogap disappears in a manner that the spectral weight fills in the pseudogap instead of closing it with increasing temperature. All these features are qualitatively consistent with ARPES for underdoped cuprates.

8 pages, 6 figures, To appear in Phys. Rev. B

Cited by in corpus (5)

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• Two-Particle Self-Consistent method for the multi-orbital Hubbard model
• Pseudogap and Superconducting Fluctuation in High-Tc Cuprates: Theory beyond 1-loop Approximation
• Induced local spin-singlet amplitude and pseudogap in high $T_c$ cuprates