Spectral scaling and quantum critical behaviour in the pseudogap Anderson model

• Main Authors: Glossop, M. T, Logan, D. E
• Format: Journal Article
• Language: English
• Published: 06-03-2003
• Subjects: Physics - Strongly Correlated Electrons
• DOI: 10.48550/arxiv.cond-mat/0303112

Europhys. Lett. 61 (2003) 810 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.