Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 90: Electronic structure of surfaces: Spectroscopy, surface states IV

O 90.1: Talk

Thursday, March 15, 2018, 10:30–10:45, MA 042

Mahan cone backfolding in Phthalocyanine overlayers on Au(111) — •Benito Arnoldi, Dominik Jungkenn, Johannes Seidel, Johannes Stöckl, Benjamin Stadtmüller, and Martin Aeschlimann — Department of Physics, TU Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany

Here, we extend our previous study of the spin-polarization of Mahan cone transitions of bare noble metals to metal-organic interfaces. For the latter material system, the long range order of the molecular film leads to clear back-folding of the central Mahan cone, i.e., to a scattering of substrate electrons at the molecular films. We employ spin and angle resolved laser ARPES with linear polarized light and 6eV photons to gain insight into the spin-polarization of the backfolded Mahan cones for monolayer films of CuPc and H2Pc on Au(111). For both molecular adsorbates, we observe a clear spin-polarization for the main Mahan cones, but not for the backfolded cones. A comparison of our results with previous findings for the Mahan cone spin polarization for the bare Au(111) surface and Bi/Au(111) interfaces will allow us to gain insight into spin-dependent scattering and spin-dependent back-folding of substrate bands at adsorbate films.