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

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

2005-01-26

arxiv.org/abs/cond-mat/0501637v1

J. Phys. Chem. B, Vol. 109, No. 14, 2005

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 7 figures

Scientific paper

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.

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