Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 55: Electronic Structure and Spin-Orbit Interaction II
O 55.3: Vortrag
Mittwoch, 13. März 2013, 16:30–16:45, H42
Determining the Rashba splitting of BiCu2/Cu(111) by STS via interband scattering — •Manuel Steinbrecher1, Hasmik Harutyunyan1, Christian R. Ast2, and Daniel Wegner1 — 1Physikalisches Institut and CeNTech, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany — 2Max Planck-Institut für Festkörperforschung, 70569 Stuttgart, Germany
Rashba systems are a promising class of materials for use in spintronics applications. They are characterized by surface states that are spin-split in k-space due to strong spin-orbit coupling. Well-known Rashba systems under recent investigation are alloys on noble metal surfaces. We have examined one of these surface alloys, Bi/Cu(111), by STM and STS measurements. By evaluating standing waves of the Rashba-split surface states, we have expanded an elegant method for measuring surface-state dispersions and compared the results with ARPES measurements and DFT calculations. For occupied states, we have found multiple intra- and interband scattering channels that enable the quantitative determination of band dispersions including the Rashba splitting. The results are in very good agreement with ARPES data and demonstrate the usefulness of this strategy to determine the band structure of Rashba systems. The lack of possible scattering channels will be discussed in terms of spin polarization and hybridization effects. We will provide an outlook on results regarding unoccupied states where DFT predictions mostly lack experimental verification.