Phys. Rev. B 68, 024508 (2003) [4 pages]Gauge-invariant response functions in algebraic Fermi liquidsReceived 29 April 2003; published 18 July 2003 A method is developed that permits a simple evaluation of two-loop response functions for fermions coupled to a gauge field. We employ this method to study the gauge-invariant response functions in the algebraic Fermi liquid, a non-Fermi liquid state proposed to describe the pseudogap phase in the QED3 theory of cuprate superconductors. The staggered spin susceptibility is found to exhibit a characteristic anomalous dimension exponent η4, while other correlators show a behavior consistent with the conservation laws imposed by the symmetries of the underlying theory. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.68.024508
DOI:
10.1103/PhysRevB.68.024508
PACS:
74.72.-h, 71.10.Hf, 11.10.Kk
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