Dresden 2006 – scientific programme
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O: Oberflächenphysik
O 19: Electronic structure II
O 19.3: Talk
Tuesday, March 28, 2006, 11:45–12:00, WIL A317
Structure of the Adatom Electron Band of the Si(111)-7×7 Surface — •Josef Mysliveček1, Anna Stróźecka1, Jan Šteffl2, Pavel Sobotík2, Ivan Ošťádal2, and Bert Voigtländer1 — 1Institut für Schichten und Grenzflächen (ISG 3) and cni – Center of Nanoelectronic Systems for Information Technology, Forschungszentrum Jülich, 52425 Jülich, Germany — 2Charles University, Faculty of Mathematics and Physics, Department of Electronics and Vacuum Physics, V Holešovičkách 2, 180 00 Praha 8, Czech Republic
Using a low temperature scanning tunelling spectroscopy we map the wave functions of the electrons in the adatom band of the Si(111)-7×7 surface in real space. We observe the splitting of the adatom electron states to “ring” (corner adatom) and “dimer” (center adatom) structures in agreement with recent theory and determine the relative energies of these structures. A high resolution of our measurement is a tradeoff for the loss of absolute energy scale due to transport limitations in tunelling spectroscopy of semiconductors at low temperatures.