Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 8: Electronic Structure and Spin-Orbit Interaction I

O 8.7: Vortrag

Montag, 31. März 2014, 12:00–12:15, GER 38

Quasiparticle spin-interference by scattering off magnetic atoms on metal surfaces with spin orbit coupling — •Philipp Rüßmann, Phivos Mavropoulos, Nguyen H. Long, David S. G. Bauer, and Stefan Blügel — Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany

We present density-functional calculations of the quasiparticle interference at surfaces due to scattering off magnetic adatoms. Our focus is on 3d impurities on Au(111) where the spin-orbit coupling (SOC) causes a Rashba-type splitting of the surface state. The spin polarization of the quasiparticle waves shows a non-collinear texture because of SOC. We investigate the dependence of the polarization on the orientation of the impurity magnetic moment. We compare to previous model-based results [1] and discuss the relation to the scattering properties of the impurity, taking into account the non-zero probability of time-reversed transitions due to the magnetic moment. In our calculations we employ the KKR-Green function method for the electronic structure and scattering properties at defects [2]. We acknowledge financial support from the DFG (SPP-1666) and from the Virtual Institute Topological Insulators of the Helmholtz Association and computational support from the JARA-HPC Supercomputing Center at the RWTH Aachen.

[1] S. Lounis, A. Bringer, and S. Blügel, Phys. Rev. Lett. 108, 207202 (2012).

[2] S. Heers, PhD Thesis, RWTH Aachen (2011); D.S.G. Bauer, PhD Thesis, RWTH Aachen (2013).