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Quantum criticality in the two-channel pseudogap Anderson model: A test of the non-crossing approximation

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons126925

Zamani,  F.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons126818

Ribeiro,  P.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons126688

Kirchner,  S.
Stefan Kirchner, cross-PKS/CPfS theory group, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zitation

Zamani, F., Chowdhury, T., Ribeiro, P., Ingersent, K., & Kirchner, S. (2013). Quantum criticality in the two-channel pseudogap Anderson model: A test of the non-crossing approximation. Physica Status Solidi B, 250(3 Sp. Iss. SI), 547-552. doi:10.1002/pssb.201200928.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0015-1F22-A
Zusammenfassung
We investigate the dynamical properties of the two-channel Anderson model using the non-crossing approximation (NCA) supplemented by numerical renormalization group (NRG) calculations. We provide evidence supporting the conventional wisdom that the NCA gives reliable results for the standard two-channel Anderson model of a magnetic impurity in a metal. We extend the analysis to the pseudogap two-channel model describing a semi-metallic host with a density of states that vanishes in power-law fashion at the Fermi energy. This model exhibits continuous quantum phase transitions between weak- and strong-coupling phases. The NCA is shown to reproduce the correct qualitative features of the pseudogap model, including the phase diagram, and to yield critical exponents in excellent agreement with the NRG and exact results. The forms of the dynamical magnetic susceptibility and impurity Green's function at the fixed points are suggestive of frequency-over-temperature scaling.