Spectral scaling and quantum critical behaviour in the pseudogap Anderson model

Abstract

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.

7 pages, 2 figures

References in corpus (3)

• Critical local-moment fluctuations, anomalous exponents, and omega/T scaling in the Kondo problem with a pseudogap
• Kondo effect of impurity moments in d-wave superconductors: Quantum phase transition and spectral properties
• On the scaling spectrum of the Anderson impurity model

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• Quantum phase transitions and thermodynamics of the power-law Kondo model
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• Interaction effects in mixed-valent Kondo insulators
• Quantum criticality in the spin-isotropic pseudogap Bose-Fermi Kondo model: entropy, scaling, and the g-theorem
• Magnetoresistance in paramagnetic heavy fermion metals