Orbital Kondo-effect from tunneling impurities

Details Orbital Kondo-effect from tunneling impurities Orbital Kondo-effect from tunneling impurities

1997-06-10

arxiv.org/abs/cond-mat/9706091v1

Physics

Condensed Matter

Strongly Correlated Electrons

review paper written for the Int. J. of Mod. Phys., 34 pages, latex, figures added as eps files

Scientific paper

10.1142/S0217979297001404

The article reviews recent results for the low energy physics of fast tunneling centers in metallic environments. For strong enough couplings to the environment these tunneling centers display an orbital Kondo effect and give rise to a non-Fermi-liquid behavior. This latter property is explained by establishing a mapping of the tunneling center model to the multichannel Kondo model via the renormalization group transformation combined with a $1/N_f$ expansion. The case of M-state systems, the role of the splittings and the present experimental situation are also discussed.

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