Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 32: Spin-Orbit Interaction at Surfaces II
O 32.6: Vortrag
Dienstag, 15. März 2011, 12:30–12:45, WIL C307
Visualizing Electron Scattering near Step Edges in the Surface States of Bismuth (111) — •Christian Bobisch1, Maren Cottin1, Johannes Schaffert1, Giriraj Jnawali1, Gustav Bihlmayer2, and Rolf Möller1 — 1Faculty of Physics, Center for Nanointegration Duisburg-Essen, University Duisburg-Essen, Lotharstr.1, 47048 Duisburg, Germany — 2Institut für Festkörperforschung and Institute for Advanced Simulations, Forschungszentrum Jülich, 52425 Jülich, Germany
Recently, many studies focus on the group V element bismuth due to its rather unique physical properties. A thin and high quality epitaxial Bi(111) film of about 25 bilayers was grown on a Si(111)-7x7 substrate. Such a thin film can serve as a prototype system to study scattering in surface states with strong spin orbit splitting. We use a low temperature scanning tunneling microscope at cryogenic temperatures (80 K) to study the electronic surface structure in the vicinity of surface step edges, thus gaining insight into the electronic structure of the Bi film with high precision and lateral resolution. In dI/dV images of a surface area including surface steps, the scattering of propagating electrons is visualized by a wave like pattern. Moreover, the Fourier transform analysis of these dI/dV maps at various voltages, i.e. various energies, reveals the spectrum of scattering vectors of electrons impinging on the surface steps.