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O: Fachverband Oberflächenphysik

O 48: Poster Session - Electronic Structure of Surfaces: Spectroscopy, Surface States

O 48.8: Poster

Dienstag, 17. März 2020, 18:15–20:00, P2/EG

Influence of strong spin-orbit coupling in strong electron correlated Bi/Sb:CeAg_x on Ag(111) — •Hendrik Bostelmann-Arp, Katharina Kissner, Simon Müller, and Friedrich Reinert — Experimental Physics VII, Julius Maximilians University of Würzburg, 97074 Würzburg

Correlated electron systems show unique ground state properties. Ce-based compounds play a particular role in the investigation of strong correlation effects due to the single 4 f-electron occupation. At low temperatures the interaction of strongly localized 4 f-electrons with itinerant conduction electrons can lead to distinct features in the electronic structure such as the Kondo-Resonance and the formation of a hybridization band gap at the Fermi edge. The hybridization gap at the Fermi level is connected to the possibility of realising a Topological Kondo-Insulator by introducing additional elements with strong spin-orbit coupling [1].
In order to understand the influence of strong spin-orbit coupling on correlated systems we present results on the Kondo-System CeAg_x on Ag(111) alloyed with elements showing strong spin-orbit coupling i.e. Bi or Sb. We study the electronic structure by means of Angle Resolved and X-Ray photoemission spectroscopy (ARPES and XPS). Furthermore changes in the geometric surface structure are studied by Low Energy Electron Diffraction (LEED). [1] M. Dzero, et al.,Phys. Rev. Lett. 104, 106408 (2010)