Gauge invariant response functions in Algebraic Fermi liquids

Details Gauge invariant response functions in Algebraic Fermi liquids Gauge invariant response functions in Algebraic Fermi liquids

2002-11-07

arxiv.org/abs/cond-mat/0211119v2

Phys.Rev.B68:024508,2003

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages REVTeX + 1 PostScript figure. Version published in PRB. For related work and info visit http://www.physics.ubc.ca/~fra

Scientific paper

10.1103/PhysRevB.68.024508

A new method is developed that permits the 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 \eta_4, while other correlators show behavior consistent with the conservation laws imposed by the symmetries of the underlying theory.

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