Phase Fluctuations and Spectral Properties of Underdoped Cuprates
M. Franz, A. J. Millis
Abstract
We consider the effect of classical phase fluctuations on the quasiparticle spectra of underdoped high-Tc cuprate superconductors in the pseudogap regime above Tc. We show that photoemission and tunneling spectroscopy data are well accounted for by a simple model in which mean field d-wave quasiparticles are semiclasically coupled to supercurrents induced by fluctuating unbound vortex-antivortex pairs. We argue that the data imply that transverse phase fluctuations are important at temperatures above Tc, while longitudinal fluctuations are unimportant at all temperatures.
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