Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 100: Electronic Structure of Surfaces: Spectroscopy, Surface States II
O 100.3: Vortrag
Donnerstag, 23. März 2017, 16:30–16:45, WIL C307
One and two-photon photoemission from the giant Rashba system Bi/Ag(111) — •Philipp Rosenzweig, Sebastian Otto, and Thomas Fauster — Lehrstuhl für Festkörperphysik, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
Time- and angle-resolved, mono- and bichromatic two-photon photo-emission (2PPE) with different photon energies hν ranging from 1.51 eV to 4.89 eV is used to study the electronic structure of the (√3×√3)R30∘ substitutional surface alloy Bi/Ag(111). Various unoccupied band structure features are found, such as a surface state dispersing downwards from around 1.1 eV above the Fermi level as well as two image-potential states with binding energies of 0.69 eV and 0.18 eV. The spin-split spz surface state [1] is also identified as an initial state in 2PPE and in one-photon photoemission at hν=6.2 eV. In addition, circular dichroism is employed as an indirect probe of the unconventional spin structure [2] of this giant Rashba system.
[1] C. R. Ast et al., Phys. Rev. Lett. 98, 186807 (2007).
[2] S. N. P. Wissing et al., Phys. Rev. Lett. 113, 116402 (2014).