Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 76: Nanostructures at surfaces: Wires, tubes
O 76.7: Vortrag
Donnerstag, 25. März 2010, 16:30–16:45, H38
Temperature-dependent Study on the Superstructure of Atomic Gold Nanowires on Ge(001) — •Christian Blumenstein1, Jörg Schäfer1, Sebastain Meyer1, Ralph Claessen1, Sbeastian Mietke2, and Rene Matzdorf2 — 1Experimentelle Physik 4, Universität Würzburg, 97074 Würzburg, Germany — 2Fachbereich Naturwissenschaften, Universität Kassel, 34132 Kassel, Germany
Self-organized atomic nanowires on semiconductor surfaces form ideal model systems for the study of physics in low dimensions. A lot of research has been conducted on the Au induced reconstructions on Si(111) and its vicinal surfaces. These wires have been discussed in terms of a Peierls-distorted state at low temperature. A relatively high transition temperature for this charge density wave (CDW) points at a significant coupling between the chains. The recently discovered Au/Ge(001) nanowires can serve as an alternative system to question the origin of the low-temperature structure. They grow in a regular c(8x2) reconstruction and cover the whole sample surface. Their lateral confinement reaches the atomic limit, while the separation between the wires is several Ge lattice constants. Therefore these exceptionally narrow chains represent a new playground for 1D physics. The talk will address the structural elements of the Au/Ge(001) chains, which have been investigated by Low Energy Electron Diffraction and Scanning Tunneling Microscopy over a wide temperature range. Special attention will be paid to superstructure periodicities and their relation to a possible CDW.