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Title

From tunneling to contact in a magnetic atom: The non-equilibrium Kondo effect

AuthorsChoi, Deung-Jang; Abufager, Paula; Limot, Laurent; Lorente, Nicolás
Issue Date2017
PublisherAmerican Institute of Physics
CitationJournal of Chemical Physics 146(9): 092309 (2017)
AbstractA low-temperature scanning tunneling microscope was employed to study the differential conductance in an atomic junction formed by an adsorbed Co atom on a Cu(100) surface and a copper-covered tip. A zero-bias anomaly (ZBA) reveals spin scattering off the Co atom, which is assigned to a Kondo effect. The ZBA exhibits a characteristic asymmetric lineshape when electrons tunnel between tip and sample, while upon the tip-Co contact it symmetrizes and broadens. Through density functional theory calculations and the non-equilibrium non-crossing approximation, we show that the lineshape broadening is mainly a consequence of the additional coupling to the tip, while non-equilibrium effects only modify the large-bias tails of the ZBA.
Publisher version (URL)https://doi.org/10.1063/1.4972874
URIhttp://hdl.handle.net/10261/176680
Identifiersdoi: 10.1063/1.4972874
issn: 0021-9606
e-issn: 1089-7690
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