Effect of phase fluctuations on the single-particle properties of underdoped cuprates

1 March 1999

journal article
research article
Published by American Physical Society (APS) in Physical Review B

Vol. 59 (9) , 6438-6448
https://doi.org/10.1103/physrevb.59.6438

Abstract

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 pseudogaplike 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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