physica status solidi (a)

Cover image for Vol. 214 Issue 5

Editor: Stefan Hildebrandt (Editor-in-Chief), Sabine Bahrs (Deputy Editor)

Online ISSN: 1862-6319

Associated Title(s): physica status solidi (b), physica status solidi (c), physica status solidi (RRL) - Rapid Research Letters

206_10/2009Front Cover (Phys. Status Solidi A 10/2009)

One of the key issues in molecular electronics and spintronics is the reproducible control of electronic and spin currents. In recent years several possibilities of controlling the electronic conductance in systems showing a Kondo resonance have been demonstrated in particular for organic molecules containing a magnetic atom. This issue's front cover Feature Article (pp. 2217–2227) discusses a simple model that captures the essential physics of such a system while simplifying the description of the many body interactions and of the molecular structure, thus offering a physical explanation for the main features of the Kondo regime. In addition, it allows predicting the behavior of the system upon other symmetry or conformational changes, or when an STM tip is moved away from the magnetic atom. The cover picture illustrates the model Hamiltonian used in this model. The central site (the magnetic atom, here Co) is described by a single atomic orbital and a strong on-site repulsion, surrounded by four molecule lobes each one described by a single atomic orbital. Two additional sites with one atomic orbital each, located above and below the Co atom, represent the apex of the STM tip and an atom on the metal surface, respectively.

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