Physics – Condensed Matter – Superconductivity
Scientific paper
2005-06-09
Physics
Condensed Matter
Superconductivity
8 pages, 7 figures. Added references
Scientific paper
10.1103/PhysRevB.73.024505
We consider the motion of conductivity spectral weight at a finite-temperature phase transition at which $d_{x^2-y^2}$ density-wave (DDW) order develops. We show that there is a shift of spectral weight to higher frequencies if the quasiparticle lifetime is assumed to be isotropic, but a shift to lower frequencies if the quasiparticle lifetime is assumed to be anisotropic. We suggest that this is consistent with recent experiments on the pseudogap phase of the cuprate superconductors and, therefore, conclude that the observation of a downward shift in the spectral weight at the pseudogap temperature does not militate against the DDW theory of the pseudogap.
Gerami Rouzbeh
Nayak Chetan
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