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Start of funding 01.01.2008
One-Dimensional Atomic Nanowires on Semiconductor Surfaces
Dr. Jörg Schäfer
University of Würzburg
Lehrstuhl für experimentelle Physik 4
Dr. Eli Rotenberg
University of California, Berkeley
Lawrence Berkeley National Laboratory, Advanced Light Source
Atomic nanowires represent a lower boundary for the miniaturization of conductors, and are thus important for ultra-small scale electronics. Self-organized metallic nanowires on semiconductors can serve as one-dimensional model systems, such as Pt or Au nanowires. At low temperature, the electron gas can give rise to charge density wave instabilities. This leads to energy gaps at the Fermi level and implies a switching from metallic to insulating behavior. The method of choice to study these effects is angle-resolved photoemission. Detailed study of the electronic effects calls for high-resolution spectra down to helium temperature. The proposed work will provide data for testing the theoretical description of 1D electron liquids in the presence of electron-lattice coupling. In this cooperation, we have developed the know-how of fabricating such atomic nanostructures. This technology will be transferred to the Californian institution for spectroscopy. The Berkeley group provides an instrument at the Advanced Light Source equipped with a photoelectron analyzer, in order to reveal the fascinating physics of these nanostructures.