Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: Poster Session III (Solid-liquid interfaces; Scanning probe and other methods; Electronic structure theory; Spin-orbit interaction)
O 58.22: Poster
Mittwoch, 13. März 2013, 18:15–21:45, Poster B1
Barrier free sub-surface incorporation of magnetic impurities into the Bi(111) surface: Manipulation of the protected surface state — •C. Klein1, P. Zahl2, N. Vollmers3, U. Gerstmann3, D. Lückermann4, D.P. Acharya2, P. Sutter2, H. Pfnürr4, C. Tegenkamp4, W.-G. Schmidt3, and M. Horn-von Hoegen1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany — 2CFN, Brookhaven National Laboratory, Upton, New York 11973, USA — 3Department of Physics, University of Paderborn, Warburger Str. 100, 33098 Paderborn, Germany — 4Institut for Solid State Physics, University of Hannover, Appelstr. 2, 30167 Hannover, Germany
Due to the large spin orbit coupling electron backscattering in the Bi(111) surface state is strongly suppressed: the surface state is protected. In order to identify possible scattering mechanism we performed low temperature scanning tunneling microscopy (LT-STM) measurements in which sub-monolayer amounts of Fe and Co were deposited into the STM at 5K. After deposition the metal atoms are immediately embedded in a sub-surface site, as they are not present in topology. In dI/dV images the embedded impurities, however, become apparent as they are surrounded by a pronounced anisotropic threefold electronic scattering pattern with lateral dimensions of more than 10 nm. Calculations indeed confirm a barrier free incorporation of the impurities into the first Bi-Bilayer even at such low temperatures. Large changes of the scattering pattern as function of the tunneling bias reflects the dispersion of the occupied and unoccupied surface state of Bi(111).