Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 49: Metal Substrates III: Structure, Epitaxy and Growth
O 49.6: Vortrag
Mittwoch, 3. April 2019, 11:45–12:00, H5
Unexpected surface structure of the Rashba system Te/Ag(111) — •Tilman Kißlinger1, Maximilian Ünzelmann2, Hendrik Bentmann2, Friedrich Reinert2, Thomas Fauster1, Alexander Schneider1, and Lutz Hammer1 — 1Lehrstuhl für Festkörperphysik, Friedrich-Alexander-Universität Erlangen-Nürnberg — 2Lehrstuhl für Experimentelle Physik VII, Julius-Maximilians Universität Würzburg
Materials with Rashba-split bands are of interest for the use in spintronics and are intensively studied by experiment and theory [1].
Especially the systems prepared by depositing one third of a monolayer of Pb, Bi, Te or Sb on Ag(111) and Cu(111), which are considered to be substitutional surface alloys, show a Rashba splitting for which the strength strongly depends on the outward relaxation of the guest atoms [2]. However, for the Te/Ag(111) system the Ag2Te surface alloy structure was never proven so far.
Upon deposition of 0.33 ML of Te on Ag(111) at temperatures between 90 K and 1000 K (and annealing to at least 373 K) we observe the formation of a (√3×√3)R30∘-structure. STM measurements reveal a perfectly ordered surface phase with terraces of the width of several thousands of Angströms. Our quantitative LEED-I(V)-analysis shows that the surface is a TeAg honeycomb layer, where the atoms occupy hcp sites of the Ag(111) substrate. This finding is supported by atomically resolved STM measurements and DFT simulations.
[1] G. Bihlmayer et al., New J. Phys. 17 050202 (2015)
[2] Gierz et al., Phys. Rev. B 81, 245430 (2010)