Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 8: Magnetic Surface Excitations

MA 8.5: Vortrag

Montag, 7. März 2016, 16:15–16:30, S052

Tailoring the magnetic ground state of a two-molecule Kondo system by chemical interactions — •T. Esat¹, B. Lechtenberg², T. Deilmann³, C. Wagner¹, P. Krüger³, R. Temirov¹, M. Rohlfing³, F.B. Anders², and F.S. Tautz¹ — ¹Peter Grünberg Institute (PGI-3), FZ Jülich, Germany — ²Institut für Festkörpertheorie, Universität Münster, Germany — ³Lehrstuhl für Theoretische Physik II, TU Dortmund, Germany

Molecules are considered to be a promising platform for spintronics since self-assembly offers the opportunity to create tailored arrays of single spins. In this context, engineering the interaction between spins is crucial for future applications.

Rather than relying on the magnetic exchange interaction to tailor the magnetic properties of a nanostructure, we propose a novel approach to achieve the same goal: it relies on the systematic use of the ubiquitous non-magnetic chemical interaction between the constituents of the nanostructure. Our approach is crucially based on spin-moment carrying orbitals that are extended in space [1] and therefore allow the direct coupling of magnetic properties to wave function overlap, i.e. the formation of chemically bonding and anti-bonding orbitals. We demonstrate the approach for a dimer of metal-molecule complexes on the Au(111) surface. Changing the wave function overlap between the two monomers, we tune the dimer through a quantum phase transition from a triplet to a singlet ground state, with one configuration being located extremely close to a quantum critical point.

[1] T. Esat et al., Phys. Rev. B 91, 144415 (2015)