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 44.55: Poster
Mittwoch, 28. März 2007, 17:00–19:30, Poster C
Multiple charge states of Ag atoms on ultrathin NaCl films — •Jascha Repp1,2, Gerhard Meyer1, Fredrik Olsson3, Sami Paavilainen4, and Mats Persson5 — 1IBM Research, Zurich Research Laboratory, 8803 Rueschlikon, Switzerland — 2Institute of Experimental and Applied Physics, University Regensburg, 93053 Regensburg, Germany — 3Department of Applied Physics, Chalmers University of Technology, 41296 Goteborg, Sweden — 4Institute of Physics, Tampere University of Technology, 33720 Tampere, Finland — 5Surface Science Research Centre and Department of Chemistry, The University of Liverpool, Liverpool L69 3BX, UK
So far the observation and manipulation by means of scanning tunneling microscopy (STM) of different charge states of adsorbed atoms have been limited to Au atoms on NaCl films supported by a Cu substrate.
On our poster, we show from a combined STM and density functional calculations study that Ag atoms adsorbed on NaCl bilayers on Cu(111) exhibit charge tristability and can be switched reversibly between the neutral adatom state and the negatively or the positively charged adatom state. Thus, the charge multistability of adatoms is not at all unique for Au adatoms and it is even possible to have more than two different charge states of an adatom. Furthermore, based on a simple model, we identify and discuss the key adatom, film and substrate parameters for the stabilization of multiple charge states. This model can be used as a guide to find other systems of interest.