Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 74: Surface and Interface Magnetism II (O jointly with MA)

O 74.1: Talk

Thursday, April 3, 2014, 10:30–10:45, WIL C107

Spin excitations in nanostructures on a Cu(111) surface: Access to the electron self-energy from first-principles — •Benedikt Schweflinghaus, Manuel dos Santos Dias, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

Magnetic excitation spectra of nanostructures are nowadays accessible by low-temperature inelastic scanning tunneling spectroscopy, see e.g. [1]. We developed a first-principles description of such spectra by combining time-dependent density functional theory and many-body perturbation theory, implemented in a code based on the Korringa-Kohn-Rostoker Green function method [2,3]. The coupling of the electrons to the spin-excitation within the adsorbate is given in terms of the electron self-energy. We analyze this key quantity for a number of clusters with different geometries placed on a Cu(111) substrate. We spin-characterize their excitation spectra and discuss how they change with the number of involved atoms, their kind, and their arrangement on the surface.
This work is supported by the HGF-YIG Programme VH-NG-717 (Functional Nanoscale Structure and Probe Simulation Laboratory, Funsilab).

[1] A. A. Khajetoorians et al., Phys. Rev. Lett. 106, 037205 (2011).

[2] S. Lounis et al., Phys. Rev. Lett. 105, 187205 (2010).

[3] S. Lounis et al., Phys. Rev. B 83, 035109 (2011).