Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 74: Graphene: Electronic Properties, Structure and Substrate Interaction II (joint session DY, DS, HL, MA, O, TT, organized by O)

TT 74.9: Vortrag

Donnerstag, 23. März 2017, 17:00–17:15, TRE Ma

Magneto-optic effects of graphene at the carbon 1s edge on metallic substrates - theory and experiment — •Dominik Legut¹, Peter M. Oppeneer², Christine Jansing³, Markus Gilbert³, Andreas Gaupp³, Hans-Christoph Mertins³, Andrey Sokolov⁴, Suk-Ho Choi⁵, Hud Wahab⁶, and Heiko Timmers⁶ — ¹IT4Innovations Center, VSB-TU Ostrava, 17.listopadu 15, CZ 70833 Ostrava, Czech Republic — ²Dept. of Physics and Astronomy, Box 530, S-751 21 Uppsala, Sweden — ³FH Münster, Stegerwaldstr. 39, D-48565 Steinfurt, Germany — ⁴HZB, Albert Einstein Str. 15, D-12489 Berlin, Germany — ⁵Dept. of Applied Physics, Kyung Hee University, Korea — ⁶Univ. of New South Wales Canberra, Australia

The optical properties at the carbon 1s of the free standing graphene utilizing the electronic structure models are calculated from first principles. For its better description the core-hole quasiparticle is taken into account. One can model it by the so-called Slater transition state employing the supercell calculation with partial hole on one of the carbon atoms with the electron charge distributed over the valence states. Another approach is to solve Bethe-Salpeter equations for the many-body electronic effects. The latter approach clearly identify the excitonic features of π- and σ-excitations of graphene. Next, optical response of the graphene on metallic substrate (Cu, Ni, and Co) is calculated and the degree of the hybridization between the p_z and d-states is determined, together with the identification of the magnetic moments. Next, using multilayerd optical code the T-MOKE and XMCD spectra are determined and compared with recently recorded data.