title: ab plane ac conductivity in the cuprates: pseudogap effects below Tc.
abstract: Building on our understanding of the superfluid density rho(s)(T), we show how the pseudogap enters the in-plane optical conductivity sigma(omega,T) for temperatures T</=T(c). Signatures in sigma(omega,T) associated with competing proposals of a "hidden order" and "superconducting" origin for the pseudogap differ in their qualitative omega,T dependences. For the latter case, as T increases from 0, Re sigma(omega) is enhanced at high and low frequencies. We discuss these theories in light of current experiments.
authors.affiliation: James Franck Institute, University of Chicago, Chicago, Illinois 60637, USA.
authors.forename: Andrew
authors.initials: A
authors.lastname: Iyengar
authors.forename: Jelena
authors.initials: J
authors.lastname: Stajic
authors.forename: Ying-Jer
authors.initials: YJ
authors.lastname: Kao
authors.forename: K
authors.initials: K
authors.lastname: Levin