Change of quasiparticle dispersion in crossing T_c in the underdoped cuprates

Abstract

One of the most remarkable properties of the high-temperature superconductors is a pseudogap regime appearing in the underdoped cuprates above the superconducting transition temperature T_c. The pseudogap continously develops out of the superconducting gap. In this paper, we demonstrate by means of a detailed comparison between theory and experiment that the characteristic change of quasiparticle dispersion in crossing T_c in the underdoped cuprates can be understood as being due to phase fluctuations of the superconducting order parameter. In particular, we show that within a phase fluctuation model the characteristic back-turning BCS bands disappear above T_c whereas the gap remains open. Furthermore, the pseudogap rather has a U-shape instead of the characteristic V-shape of a d_{x^2-y^2}-wave pairing symmetry and starts closing from the nodal k=(pi/2,pi/2) directions, whereas it rather fills in at the anti-nodal k=(pi,0) regions, yielding further support to the phase fluctuation scenario.

arXiv comment6 pages, 4 eps-figures

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• Pseudogap and charge density waves in two dimensions
• Non-monotonic pseudo-gap in high-Tc cuprates
• ARPES on HTSC: simplicity vs. complexity
• Effects of inhomogeneities and thermal fluctuations on the spectral function of a model d-wave superconductor
• Precursor effects of the superconducting state caused by d-wave phase-fluctuations above Tc