Orbital Kondo behavior from dynamical structural defects

Abstract

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 $1\mathrm{K}$ and it can be of the same order of magnitude as the renormalized splitting $\Delta$. However, in the perturbative regime we always find that $T_K \alt Δ$ 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, ${\omega }_{\mathrm{Debye}}$.

9 pages, 9 figures, RevTeX

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• Role of surface anisotropy for magnetic impurities in electron dephasing and energy relaxation and their size effect
• Hamiltonian theory of the strongly-coupled limit of the Kondo problem in the overscreened case
• Energy relaxation due to magnetic impurities in mesoscopic wires: Logarithmic approach
• Electron Dephasing in Mesoscopic Metal Wires
• Can the Spin-Orbit Interaction Break the Channel Degeneracy of the Two-Channel Orbital Kondo Problem?