Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 88: Electronic Structure: Surface Magnetism and Spin Phenomena

O 88.7: Talk

Thursday, March 19, 2015, 16:30–16:45, MA 042

Spin-Dependent Size of an Interband Hybridization Gap in the Unoccupied Band Structure of Pb/Cu(111) — •Katharina T. Ritter¹, Sune N. P. Wissing¹, Peter Krüger², Anke B. Schmidt¹, and Markus Donath¹ — ¹Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Germany — ²Institut für Festkörpertheorie, Westfälische Wilhelms-Universität Münster, Germany

Hybridization gaps between states of similar orbital character may become spin dependent in the presence of strong spin-orbit coupling. Using a monolayer of Pb on Cu(111) as a model system, we show that the size of these gaps itself depends on the spin direction of the states.

We use spin- and angle-resolved inverse photoemission in combination with first-principle calculations to investigate the unoccupied electronic structure of Pb/Cu(111). Above the Fermi level we find a spin-dependent hybridization gap where the splitting yields 200 meV for one and even 500 meV for the other spin direction. To gain a greater insight into the hybridization mechanism, an effective two-band tight binding model is developed. Within this model we show that the interaction of substrate and adlayer is crucial to induce a sizeable spin-orbit coupling and hybridization strength to the system.