Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: 2D materials beyond graphene: TMDCs, silicene and relatives II
O 58.3: Vortrag
Mittwoch, 14. März 2018, 11:00–11:15, MA 043
Unoccupied band structure of Si nanoribbons on Ag(110) — •Nils Fabian Kleimeier1,2, Gabi Wenzel1, Adrian Joe Urban1, Jürgen Braun3, Hubert Ebert3, Elena Voloshina4, Yuriy Dedkov4, and Helmut Zacharias1,2 — 1Physikalisches Institut, Westfälische Wilhelms-Universität Münster — 2Center for Soft Nanoscience (SoN), Westfälische Wilhelms-Universität Münster — 3Department Chemie, Ludwig-Maximilians-Universität München — 4International Centre for Quantum and Molecular Structures, Shanghai University
Adsorption of Si atoms on the Ag(110) surface leads to the formation of monolayer silicon nanoribbons along the [110] direction. Depending on the surface temperature during adsorption, nanoribbons with widths of either 0.8 nm or 1.6 nm, as determined by STM, are formed, leading to a (3× 2) or (5× 2) reconstruction, respectively. Employing k-resolved inverse photoemission spectroscopy (KRIPES), the unoccupied band structure of both reconstructions has been determined and is compared to measured and calculated KRIPES spectra of the bare Ag(110) surface. The experimental results for the band structures of both nanoribbon types are compared to DFT calculations for different pentagonal as well as hexagonal silicon nanoribbon models on Ag(110) found in the literature. As expected for one-dimensional materials, all states associated with the nanoribbons show no dispersion in the Γ Y direction (across the nanoribbons), but disperse in Γ X direction (along the nanoribbons).