Orbital Kondo behavior from dynamical structural defects

Details Orbital Kondo behavior from dynamical structural defects Orbital Kondo behavior from dynamical structural defects

2003-02-17

arxiv.org/abs/cond-mat/0302334v1

Phys. Rev. B 68, 045114 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 9 figures, RevTeX

Scientific paper

10.1103/PhysRevB.68.045114

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 $T_K$ is computed as a function of barrier parameters. We find that for special parameters $T_K$ can be close to $1 {\rm K}$ and it can be of the same order of magnitude as the renormalized splitting $\Delta$. However, in the perturbative regime we always find that $T_K \alt \Delta $ with a $T_K \alt 1 {\rm K}$ [Aleiner {\em et al.}, Phys. Rev. Lett. {\bf 86}, 2629 (2001)]. We also find that $\Delta$ remains unrenormalized at energies above the Debye frequency, $\omega_{\rm Debye}$.

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