Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)
O 59.16: Poster
Mittwoch, 24. März 2010, 17:45–20:30, Poster B1
Investigation of the geometric structure of one-dimensional Au nanowires on the Ge(001) surface with STM and LEED — •Sebastian Mietke1, Melanie Klinke1, Tatjana Podlich1, René Matzdorf1, Christian Blumenstein2, Jörg Schäfer2, Sebastian Meyer2, and Ralph Claessen2 — 1Fachbereich Naturwissenschaften, Experimentalphysik II, Universität Kassel, 34132 Kassel, Germany — 2Physikalisches Institut, Universität Würzburg, 97074 Würzburg, Germany
The deposition of Au on a clean Ge(001) surface yields one-dimensional (1D) structures, so-called nanowires. Using the techniques of low-temperature scanning tunneling microscopy (LT-STM) and low-energy electron diffraction (LEED), it could be demonstrated that the resulting surface reconstruction exhibits excellent c(8×2) long-range order. Since the wires are confined to atomic dimension, this system renders an ideal playground for the study of 1D physics, such as the charge density wave (CDW) or a Luttinger liquid. Experimentally, we find in addition to the c(8×2) structure that a fourfold superstructure along the wire direction exists over a wide temperature range. As the origin of the superstructure, the appearance of a CDW could be excluded by using scanning tunneling spectroscopy. By studying occupied and unoccupied states with the STM it could be shown that the nanowires consist of Au chains of single atom dimension.