Friedel oscillations and the Kondo screening cloud

Details Friedel oscillations and the Kondo screening cloud Friedel oscillations and the Kondo screening cloud

2008-02-03

arxiv.org/abs/0802.0280v4

Phys. Rev. B 77, 180404(R) (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

More extensive discussion of experimental situation and referencing of earlier work added

Scientific paper

10.1103/PhysRevB.77.180404

We show that the long distance charge density oscillations in a metal induced by a weakly coupled spin-1/2 magnetic impurity exhibiting the Kondo effect are given, at zero temperature, by a universal function F(r/xi_K) where r is the distance from the impurity and xi_K, the Kondo screening cloud size =v_F/T_K, where v_F is the Fermi velocity and T_K is the Kondo temperature. F is given by a Fourier-like transform of the T-matrix. Analytic expressions for F(r/xi_K) are derived in both limits r much less than xi_K and r much greater than xi_K and F is calculated for all r/xi_K using numerical methods.

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