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O: Fachverband Oberflächenphysik

O 118: Surface Magnetism II (joint session O/MA)

O 118.8: Vortrag

Freitag, 20. März 2020, 12:15–12:30, GER 38

Theoretical description of single-Co Kondo effect in atomic Cu wires on Cu(111) — Nicolas Néel¹, Markus Bohn¹, Jörg Kröger¹, •Malte Schüler^2,3, Bin Shao^2,3, Tim Wehling^2,3, Alexander Kowalski⁴, and Giorgio Sangiovanni⁴ — ¹Institute for Physics, Technical University of Ilmenau — ²Bremen Center for Computational Materials Science, University Bremen, — ³Institute for Theoretical Physics, University Bremen — ⁴Institute for Theoretical Physics and Astrophysics and Würzburg-Dresden Cluster of Excellence ct.qmat, University of Würzburg

Linear atomic chains containing a single Kondo atom, Co, and several nonmagnetic atoms, Cu, assembled atom by atom on Cu(111) with the tip of a scanning tunneling microscope show a peculiar evolution of the Kondo resonance. The evolution of this resonance can be inferred from changes in the line shape of the Abrikosov-Suhl-Kondo resonance. Strikingly, for two geometries no Kondo resonance at all is observed. We perform state-of-the-art first-principles calculations to describe the resonance and unravel possible microscopic origins of the remarkable experimental observations. We focus on the fact that the theoretical results are in line with experimental findings for all but two geometries which show no resonance and draw conclusions on the current state of theoretical description of many-body phenomena in real materials.