Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 32: 2D Materials I: Structure and Electronic Properties
O 32.5: Vortrag
Dienstag, 8. März 2016, 11:30–11:45, H24
Low energy electron diffraction and angle resolved photoemission studies of Sn/Au(111) reconstructed surfaces — •Mahalingam Maniraj1, Sebastian Emmerich1, Dominik Jungkenn1, Sebastian Jakobs1, Benjamin Stadtmüller1, Mirko Cinchetti1, Stefan Mathias2, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, Erwin-Schrödinger-Straße 46, 67663 Kaiserslautern, Germany — 2I. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
Recent experimental realization of Stanene, a two dimensional allotrope of Sn in a graphene-like structure, has motivated intense research on related Sn based ultrathin materials. We have investigated the growth of Sn on Au(111). Using low energy electron diffraction (LEED) and angle-resolved photoemission spectroscopy, we found five surface reconstructions, each with a distinct band structure. Starting from a coverage of 0.3 monolayers, Sn forms a (√3×√3)R30∘ surface alloy which transforms into a complex superstructure for higher Sn coverages. An angle-resolved photoemission study shows inverted V-shaped bands which are symmetrically centered at the Gamma-point. Additionally, we observed states with parabolic dispersion showing a Rashba-type spin splitting. A direct comparison between our experimental results and band structure calculations will allow us to discuss the formation of Stanene-like band dispersions for these Sn/Au reconstructed surfaces.