Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 5: Spin-Orbit Interaction at Surfaces I

O 5.6: Vortrag

Montag, 14. März 2011, 12:30–12:45, WIL B321

Anisotropic Scattering of Bi(111) Surface State Electrons at a Point Defect Visualized by Low Temperature Scanning Tunneling Microscopy and Spectroscopy — •Maren Cottin¹, Christian Bobisch¹, Johannes Schaffert¹, Andreas Sonntag¹, Giriraj Jnawali¹, Gustav Bihlmayer², and Rolf Möller¹ — ¹Faculty of Physics, Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, 47048 Duisburg, Germany — ²Institut für Festkörperforschung and Institute for Advanced Simulation, Forschungszentrum Jülich, 52425 Jülich, Germany

The semimetal bismuth (Bi) has recently attracted a lot of attention due to its interesting transport properties. The metallic surface states which occur on various of its surfaces underlie a large spin orbit splitting. We use scanning tunneling microscopy to analyze the lateral variation in the local density of states in the vicinity of a point defect on a Bi(111)-surface. The observed pattern in the dI/dV-images visualizes the scattering of surface state electrons. At energies close to the Fermi level, the pattern is highly anisotropic and shows a threefold symmetry. Using the calculated Fermi surface of Bi(111) the scattering processes are ascribed to spin-conserving transitions between two spin orbit split surface states. The scattering pattern can be simulated by the superposition of three monochromatic waves where the phase with respect to the scattering center has a significant impact on the appearance and the symmetry of the pattern.