Journal
EUROPHYSICS LETTERS
Volume 61, Issue 6, Pages 810-816Publisher
E D P SCIENCES
DOI: 10.1209/epl/i2003-00306-3
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The pseudogap Anderson impurity model provides a classic example of an essentially local quantum phase transition. Here we study its single-particle dynamics in the vicinity of the symmetric quantum critical point (QCP) separating generalized Fermi-liquid and local-moment phases, via the local-moment approach. Both phases are shown to be characterized by a low-energy scale that vanishes at the QCP; and the universal scaling spectra, on all energy scales, are obtained analytically. The spectrum precisely at the QCP is also obtained; its form showing clearly the non Fermi-liquid, interacting nature of the fixed point.
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