Orbital Kondo behavior from dynamical structural defects

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The interaction between an atom moving in a model double-well potential and the conduction electrons is treated using renormalization group methods in next-to-leading logarithmic order. A large number of excited states is taken into account and the Kondo temperature Tₖ is computed as a function of barrier parameters. We find that for special parameters Tₖ can be close to 1 K and it can be of the same order of magnitude as the renormalized splitting Δ. However, in the perturbative regime we always find that Tₖ Δ with a Tₖ 1 K [Aleiner et al., Phys. Rev. Lett. 86, 2629 (2001)]. We also find that Δ remains unrenormalized at energies above the Debye frequency, ω Debye.