Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 79: Scanning Probe Techniques: STM

O 79.5: Hauptvortrag

Donnerstag, 19. März 2015, 11:30–12:00, HE 101

Spin Excitations and Correlations in Individual Molecules on Surfaces — •Markus Ternes — Max-Planck-Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany

Scanning probe microscopes and, in particular, the scanning tunneling microscope have been shown to be very powerful tools for the investigation of magnetism at the atomic and molecular scale.

In my talk I will discuss recent results on an all organic radical molecule with S=1/2 and on cobalt-hydrogen complexes adsorbed on a strongly anisotropic surface. In these systems we detect the quantum magnetism by inelastic spin-flip excitations and the emergence of correlation effects which are due to the interactions between the localized spin and the substrate electrons. I will show that the results can be well understood by employing third-order scattering theory using a Kondo Hamiltonian which also enables a deeper insight into spectroscopic features measured on single atoms. Expanding this model by coupling the spin to a dissipative quantum bath, enables to understand the experimentally observed interplay between magnetic anisotropy and the exchange interactions with the substrate. Furthermore, I will show that by changing the coupling between individual spins the emerging spectroscopic features enables to determine the spin-spin correlation quantitatively.