2003/02/17 by L. Borda, A. Zawadowski, G. Zarand
Physics and Astronomy · #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.68.045114
published as Phys. Rev. B 68, 045114 (2003) · 9 pages, 9 figures, RevTeX
arxiv created 2003/02/17 · arxiv updated 2009/11/30
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 \rm 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 \alt Δ with a TK \alt 1 \rm K [Aleiner \em et al., Phys. Rev. Lett. \bf 86, 2629 (2001)]. We also find that Δ remains unrenormalized at energies above the Debye frequency, ω\rm Debye.