The Kondo screening cloud: what can we learn from perturbation theory?

Details The Kondo screening cloud: what can we learn from perturbation theory? The Kondo screening cloud: what can we learn from perturbation theory?

1996-04-04

arxiv.org/abs/cond-mat/9604032v2

Physics

Condensed Matter

4 pages, 2 EPS figures, submitted to PRL; a missing term has been added to Eq. (9); this additional term doesn't effect our ma

Scientific paper

10.1103/PhysRevLett.76.4959

We analyse the role which the distance scale $\xi_K = v_F/T_K$ plays in the single-impurity Kondo problem using renormalization group improved perturbation theory. We derive the scaling functions for the local spin susceptibility in various limiting cases. In particular, we demonstrate exactly that the non-oscillating part of it should be short-range, i.e., vanish for distances $r \gg 1/k_F$ and show explicitly that the interior of the screening cloud {\it does not} exhibit weak coupling behavior.

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