Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 48: Focused Session: Spin-Orbit Interaction at Surfafces: From the Rashba Effect to Topological States of Matter I
O 48.5: Vortrag
Donnerstag, 26. März 2009, 12:15–12:30, HSZ 02
Electronic Structure of the Bi/Cu(111) surface alloy and its modification upon Na adsorption — •Hendrik Bentmann1, Holger Schwab1, Frank Forster1, Gustav Bihlmayer2, Luca Moreschini3, Marco Grioni3, and Friedrich Reinert1,4 — 1Universität Würzburg, Experimentelle Physik II, Am Hubland, D-97074 Würzburg, Germany — 2Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany — 3Ecole Polytechnique Fédérale de Lausanne (EPFL), Institut de Physique des Nanostructures, CH-1015 Lausanne, Switzerland — 4Forschungszentrum Karlsruhe, Gemeinschaftslabor für Nanoanalytik, D-76021 Karlsruhe, Germany
Employing angle-resolved photoelectron spectroscopy (ARPES) we have investigated the electronic structure of the long-range ordered surface alloy Bi-Cu(111)(√3×√3)R30∘ and its modification after Na adsorption. On the clean alloy we observe a spin-split surface state band with an energy maximum approximately 230 meV above the Fermi level. By doping the surface alloy with Na we are able to tune the position of Fermi level relative to the surface state continously. Our data provides direct information about electronic states above the Fermi level. This allows for an unambiguous deduction of the surface electronic structure and the Rashba parameters. The experimental findings are fully confirmed by first principles calculations.