Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 99: 2D materials beyond graphene: TMDCs, silicene and relatives IV

O 99.9: Vortrag

Donnerstag, 15. März 2018, 17:15–17:30, MA 043

Two-photon photoemission spectroscopy of the Dirac cone of a stanene-like Sn/Au(111) surface reconstruction — •M. Düvel¹, M. Maniraj², B. Stadtmüller^{2, 3}, D. Jungkenn², M. Keunecke¹, S. Emmerich^{2, 3}, D. Schmitt¹, W. Shi^4,5, L. Lyu², J. Stöckl², J. Kollamana², Z. Wei², A. Jurenkow², S. Jakobs², B. Yan⁴, D. Steil¹, S. Steil¹, M. Cinchetti⁶, M. Aeschlimann², and S. Mathias¹ — ¹I. Physikalisches Institut, Georg-August-Universität Göttingen — ²Department of Physics and Research Center OPTIMAS, University of Kaiserslautern — ³Graduate School of Excellence Materials Science in Mainz — ⁴MPI for Chemical Physics of Solids — ⁵School of Physical Science and Technology, ShanghaiTech University — ⁶Experimentelle Physik VI, Technische Universität Dortmund

Stanene, the graphene analog of Sn, was recently predicted and has subsequently motivated intense research on the realization of Sn-based ultrathin materials. Using photoelectron spectroscopy, we recently found a superstructure of Sn on Au(111) that reveals a Dirac-like band centered at the Γ-point with anti-parallel spin polarization and a Fermi velocity of v_F ≈ 1· 10⁶ m/s [Maniraj et al., submitted (2017)]. Using angle-resolved two-photon photoemission spectroscopy, we now access the unoccupied part of the electronic structure of this stanene-like reconstruction. We are able to map the dispersion of the unoccupied part of the surface states and therewith confirm their massless Dirac-like nature. Moreover, we find a series of image potential states, which we analyze in order to determine the interfacial coupling between the stanene-like layer and the Au substrate.