Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 5: Spin-Orbit Interaction at Surfaces I
O 5.2: Vortrag
Montag, 14. März 2011, 11:30–11:45, WIL B321
Spin-resolved electronic structure of the surface Rashba-system Bi/Cu(111) — •Hendrik Bentmann1, Takuya Kuzumaki2, Gustav Bihlmayer3, Kazuyuki Sakamoto2, and Friedrich Reinert1 — 1Universität Würzburg, Experimentelle Physik VII, Am Hubland, D-97074 Würzburg, Germany — 2Graduate School of Advanced Integration Science, Chiba University, Chiba 263-8522, Japan — 3Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany
Recently several surface adsorbate systems on metal and semiconductor substrates have been identified whose electronic structure is heavily influenced by the spin-orbit interaction. The spin orientation of the polarized electronic states in these systems can show quite unexpected effects including sign changes within a single band or even a complete rotation out of the plane [1,2]. Here we report spin- and angle-resolved photoemission experiments on the surface alloy Bi-Cu(111)(√3×√3)R30∘. The results directly demonstrate that the Bi-induced surface state bands of spz orbital character are split in energy by the spin-orbit interaction. The spin orientation is found to be in accordance with the Rashba model within the probed energy window. Another surface state of pxpy character shows no spin polarization suggesting that this state consists of two unresolvable components of opposite spin orientation. First-principles calculations of the spin orientation vectors are in line with the experimental observations.
[1] H. Mirhosseini et al., Phys. Rev. B 79, 245428 (2009).
[2] K. Sakamoto et al., Phys. Rev. Lett 103, 156801 (2009).