Local quantum critical point in the pseudogap Anderson model: finite-T dynamics and omega/T scaling

2005/01/26 by Matthew T Glossop, Gareth E Jones, David E Logan · 2 citations
Physics and Astronomy · #cond-mat.str-el

paper · pdf

published as J. Phys. Chem. B, Vol. 109, No. 14, 2005 · 12 pages, 7 figures

arxiv created 2005/01/26 · arxiv updated 2009/12/01

Abstract

The pseudogap Anderson impurity model is a paradigm for locally critical quantum phase transitions. Within the framework of the local moment approach we study its finite-T dynamics, as embodied in the single-particle spectrum, in the vicinity of the symmetric quantum critical point (QCP) separating generalized Fermi-liquid (Kondo screened) and local moment phases. The scaling spectra in both phases, and at the QCP itself, are obtained analytically. A key result is that pure omega/T-scaling obtains at the QCP, where the Kondo resonance has just collapsed. The connection between the scaling spectra in either phase and that at the QCP is explored in detail.

Cited by

• Power-Law Spectra and Asymptotic ω/T Scaling in the Orbital-Selective Mott Phase of a Three-Orbital Hubbard Model
• Universal Mott quantum criticality in a modified periodic Anderson model

Related

• Phase transitions in the pseudogap Anderson and Kondo models: Critical dimensions, renormalization group, and local-moment criticality
• Emergent Properties of the Periodic Anderson Model: a High-Resolution, Real-Frequency Study of Heavy-Fermion Quantum Criticality
• Upper-critical dimension in a quantum impurity model: Critical theory of the asymmetric pseudogap Kondo problem
• Critical properties of the Fermi-Bose Kondo and pseudogap Kondo models: Renormalized perturbation theory
• Influence of a bosonic environment onto the non-equilibrium dynamics of local electronic states in a quantum impurity system close to a quantum phase transition