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O: Fachverband Oberflächenphysik
O 55: Poster Session III - MA 141/144 (Methods: Atomic and Electronic Structure; Particles and Clusters; Heterogeneous Catalysis; Semiconductor Substrates: Epitaxy and Growth+Adsorption+Clean Surfaces+Solid-Liquid Interfaces; Oxides and Insulators: Solid-Liquid Interfaces+Epitaxy and Growth; Phase Transitions; Metal Substrates: Adsorption of Inorganic Molecules+Epitaxy and Growth; Surface Chemical Reactions; Bimetallic Nanosystems: Tuning Physical and Chemical Properties; Oxides and insulators: Adsorption; Organic, polymeric, biomolecular films; etc.)
O 55.3: Poster
Mittwoch, 27. Februar 2008, 18:30–19:30, Poster F
Two-photon Photoemission spectroscopy of the clean and alkali-doped 1T-TiSe2 transition-metal dichalcogenide — •Martin Wiesenmayer, Jens Buck, Timm Rohwer, Kai Rossnagel, Lutz Kipp, and Michael Bauer — Institut für Experimentelle und Angewandte Physik, Universität Kiel, 24098 Kiel, Germany
The transition-metal dichalcogenide 1T-TiSe2 has attracted considerable attention in the recent past due to a structural phase transition at T≈ 200 K accompanied by the formation of a charge density wave (CDW) state. In a two-photon photoemission (2PPE) study we investigated the electron excitation spectra of these two phases in the vicinity of the Γ point of the Brillouin zone and their modification due to the adsorption and intercalation of different alkali species. We are able to identify a characteristic excitation band as well as phase- and intercalation specific modifications in the vicinity of the Fermi edge. Our experiments are furthermore supported by time-resolved 2PPE measurements addressing the ultrafast decay dynamics of the electron excitations. Our results will be discussed under consideration of corresponding results from past photoemission and inverse photoemission studies.