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O: Fachverband Oberflächenphysik
O 21: Graphene: Growth & Intercalation
O 21.4: Vortrag
Dienstag, 17. März 2015, 11:15–11:30, MA 041
Ir(111) surface state stability against Li adsorption: role of graphene — •Petar Pervan1, Ivo Pletikosić2, Marin Petrović1, Iva Šrut Rakić1, Marko Kralj1, Milorad Milun1, Tonica Valla2, and Predrag Lazić3 — 1Institut za fiziku, Bijenička 46, 10000 Zagreb, Croatia — 2Department of Condensed Matter Physics & Materials Science, Brookhaven National Lab, Upton — 3Institut Rudjer Bošković, Bijenička 54, 10000 Zagreb, Croatia
Surface states (SS) are known to be extremely sensitive to the presence of defects or adsorbates with the effect that any surface state would disappear in response to submonolayer coverage of adsorbates. Moreover, adsorbates can induce a change of the surface potential which in turn may strongly affect its binding energy. In this work we report on the Li intercalation of graphene on Ir(111) and its influence on the Ir surface state at the K point studied by means of the Low Energy Electron Diffraction (LEED), the Angle Resolved Photoemission Spectroscopy (ARPES) and the Density Functional Theory (DFT). We have found that at all stages of the Li intercalation the integrity of the surface state at the K point has been preserved. Despite the increase of the SS binding energy its spectral intensity and the width were constant at all Li concentrations. This finding suggests an unperturbed surface state coherence at the K point. Away from the K point the surface state exhibits strong hybridization with graphene pi bands which is accompanied by the opening of the band gap at higher binding energy with respect to the hybridisation point.