Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-01-24
Nature Physics Volume: 7, Pages: 203-206 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 3 figures + 8 pages supplementary material; Nature Physics (Jan 2011 - advanced online publication)
Scientific paper
10.1038/nphys1876
The Kondo effect, one of the oldest correlation phenomena known in condensed matter physics, has regained attention due to scanning tunneling spectroscopy (STS) experiments performed on single magnetic impurities. Despite the sub-nanometer resolution capability of local probe techniques one of the fundamental aspects of Kondo physics, its spatial extension, is still subject to discussion. Up to now all STS studies on single adsorbed atoms have shown that observable Kondo features rapidly vanish with increasing distance from the impurity. Here we report on a hitherto unobserved long range Kondo signature for single magnetic atoms of Fe and Co buried under a Cu(100) surface. We present a theoretical interpretation of the measured signatures using a combined approach of band structure and many-body numerical renormalization group (NRG) calculations. These are in excellent agreement with the rich spatially and spectroscopically resolved experimental data.
Dargel Piet E.
Peters Robert
Pruschke Thomas
Prüser Henning
Ulbrich Rainer G.
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