Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session I (Metal, semiconductor and oxide substrates: structure and adsorbates; Graphene)
O 35.1: Poster
Dienstag, 12. März 2013, 18:15–21:45, Poster B1
Electronic structure of Ag(100) revisited by STS — •Robin Ohmann1, Cormac Toher1, Jörg Meyer1, Anja Nickel1, Francesca Moresco1, and Gianaurelio Cuniberti1,2 — 1Institute for Materials Science and Max Bergmann Center of Biomaterials, Technische Universität Dresden, 01062 Dresden, Germany — 2Division of IT Convergence Engineering, POSTECH, Pohang 790-784, Republic Korea
The Ag(100) surface is used for many surface science studies as a substrate. Therefore, a clear knowledge about its electronic properties is desirable. In contrast to previous results, we present an experimental study on Ag(100) revealing an electronic state, at which electrons behave like in a two-dimensional electron gas. Conductance maps taken with scanning tunneling spectroscopy (STS) show energy dependent standing wave patterns at step edges and defects, from which the dispersion relation is extracted. We find a parabolic behaviour with a state onset of 1.9 eV above the Fermi energy and an effective mass of 0.41 me. Scanning tunneling spectra reveal a clear feature at the relevant energy. Additionally, the lifetime, linewidth and coherence length have been measured as a function of energy. Theoretical calculations have been performed to elucidate the experimental findings.