Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 88: Electronic Structure: Surface Magnetism and Spin Phenomena

O 88.3: Talk

Thursday, March 19, 2015, 15:30–15:45, MA 042

Barrier free sub-surface incorporation of 3d-transition metals into the Bi(111) surface — •Claudius Klein¹, Nora J. Vollmers², Percy Zahl³, Uwe Gerstmann², Wolf Gero Schmidt², Peter Sutter³, and Michael Horn-von Hoegen¹ — ¹Faculty of Physics and Center for Nanointegration CENIDE, University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany — ²Department of Physics, University of Paderborn, Warburger Str. 100, 33098 Paderborn, Germany — ³Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA

For the interesting class of materials with spin-polarized two-dimensional surface states, Bi(111) is a perfect and well understood model system. By combining low temperature scanning tunneling microscopy (LT-STM) measurements and density functional theory, we found the Bi(111) surface to have a well-defined incorporation site for 3d-transition metals within the first bilayer. Atoms like Fe, Co, Ni, Cu become immediately barrier-free embedded and are located within the same specific sub-surface site, as they are not present in STM topography. They only become apparent in STS at tunneling conditions close to the Fermi-energy, as they are surrounded by a pronounced anisotropic threefold electronic scattering pattern. The influence of sample temperature and high coverage regimes for possible surface delta-doping are investigated. Furthermore, this incorporation effect is also observed for some 4d and 5d transition metals.