Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 38: Halbleiteroberfl
ächen und -grenzfl
ächen
O 38.4: Vortrag
Dienstag, 8. März 2005, 11:30–11:45, TU EB301
Electronic structure of Ge(001) surface studied by room temperature scanning tunneling spectroscopy — •Oguzhan Gurlu1,2, Harold J.W. Zandvliet1, and Bene Poelsema1 — 1Solid State Physics Group, MESA+ Research Institute, University of Twente, PO. Box. 217, 7500AE Enschede, The Netherlands — 2Max-Planck Institut fur Festkorperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
The surface electronic structure of Ge(001) has been studied by scanning tunneling spectroscopy. The measured surface densities of states unequivocally reveals the presence of a metallic state on the (2x1) domains, which is absent on the c(4x2) domains. This metallic state, so far only observed in integral measurements, is attributed to the flip-flopping dimers, which constitute the (2x1) domains. Our data also reveals a set of previously unresolved surface states, in perfect agreement with published theoretical predictions.