Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 44: Poster Session II (Semiconductors; Oxides and Insulators: Adsorption, Clean Surfaces, Epitaxy and Growth; Surface Chemical Reactions and Heterogeneous Catalysis; Surface or Interface Magnetism; Solid-Liquid Interfaces; Organic, Polymeric, Biomolecular Films; Particles and Clusters; Methods: Atomic and Electronic Structure; Time-resolved Spectroscopies)
O 44.39: Poster
Mittwoch, 28. März 2007, 17:00–19:30, Poster C
Tunneling through single atoms — •Martyna Polok, Dmitry Fedorov, Michael Czerner, and Ingrid Mertig — Martin Luther University Halle-Wittenberg, Department of Physics, Institute of Theoretical Physics, 06099 Halle (Saale), Germany
Scanning tunneling microscopy (STM) is of great importance nowadays, since it allows for probing electronic and magnetic properties of surfaces.
In this study we concentrate on the theoretical description of a Cu tip interacting with a Co adatom adsorbed on the Cu (100) surface. The ground state electronic structure of the system was determined by means of density functional theory (DFT) combined with the screened Korringa-Kohn-Rostoker (KKR) Green’s function method. It was shown that with the varying tip-surface distance d the geometry of the system undergoes complex structural relaxation[1].
We use Kubo linear response theory in Baranger-Stone formulation to find the conductance of the system for different d. The attention is focused on the value of the tunneling current as a function of d. Additionally we want to determined precisely the tip-surface distance d0 for which the conductance changes from the tunneling to the contact mode. Results pertaining to tunneling regime will be presented.
[1] R. Z. Huang et al., Phys. Rev. B 12, 8169 (2006)