Regensburg 2016 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 8: Correlated Electrons: Quantum Impurities, Kondo Physics
TT 8.5: Talk
Monday, March 7, 2016, 11:15–11:30, H21
Tailoring the magnetic ground state of a two-molecule Kondo system by chemical interactions — •Benedikt Lechtenberg1, Taner Esat3, Thorsten Deilmann2, Christian Wagner3, Peter Krüger2, Ruslan Temirov3, Michael Rohlfing2, F. Stefan Tautz3, and Frithjof B. Anders1 — 1Technische Universität Dortmund, Lehrstuhl für Theoretische Physik II, 44221 Dortmund — 2Peter Grünberg Institute, Forschungszentrum Jülich, 52425 Jülich — 3Institut für Festkörpertheorie, WWU Münster, 48149 Münster
We propose a novel approach for tailoring the magnetic properties of a nanostructure that relies on the ubiquitous non-magnetic chemical interaction between the constituents of the nanostructure instead of a magnetic exchange interaction. This is demonstrated in a dimer of metal-molecule complexes on the Au(111) surface: Changing the tunneling between both complexes, we tune the coupled dimer through a quantum phase transition from an underscreened Kondo doublet to a singlet ground state. In this talk, we explain the nature of the competing ground states and the role of parity breaking for the understanding of the STM spectra. Employing the results of a LDA calculation as a first principle input for a numerical renormalization group calculation, we are able to reproduce the experiment with excellent agreement.