The effect of phase fluctuations on the single-particle properties of the underdoped cuprates

Details The effect of phase fluctuations on the single-particle properties of the underdoped cuprates The effect of phase fluctuations on the single-particle properties of the underdoped cuprates

1998-09-16

arxiv.org/abs/cond-mat/9809225v2

Physical Review B 59, 6438 (1999)

Physics

Condensed Matter

Superconductivity

RevTex 11 pages; 11 epsf figures included. Added and updated references

Scientific paper

10.1103/PhysRevB.59.6438

We study the effect of order parameter phase fluctuations on the single-particle properties of fermions in the underdoped cuprate superconductors using a phenomenological low-energy theory. We identify the fermion-phase field coupling as the Doppler-shift of the quasiparticle spectrum induced by the fluctuating superfluid velocity and we calculate the effect of these fluctuations on the fermion self-energy. We show that the vortex pair unbinding near the superconducting transition causes a significant broadening in the fermion spectral function, producing a pseudogap-like feature. We also discuss the specific heat and show that the phase fluctuation effect is visible due to the short coherence length.

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