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The Kondo effect is a classic paradigm in condensed matter theory, which describes the dynamic screening of a quantum impurity embedded in a metallic host. The underlying renormalization group (RG) description of such problems is by now very well understood. But comparatively little is known in real-space: while a length-scale associated with the screening process has been proposed theoretically, its physical interpretation remains controversial. We demonstrate that as one moves away from the impurity, physical quantities evolve in a characteristic way, reproducing fully the RG flow between fixed points. Behaviour typical of each fixed point can thus be identified in distinct regions of space. The implications of these results are discussed in relation to the popular 'Kondo screening cloud' picture.

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Dr. Andrew Mitchell, Institut für Theoretische Physik, Universität zu Köln
Seminarraum Theoretische Physik
Contact: not specified