Dresden 2014 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 45: Poster IV: One-Dimensional Metals: Reality or Fiction

DS 45.6: Poster

Donnerstag, 3. April 2014, 16:00–19:00, P1

Structural studies on self-assembled atomic gold nanowires of the Si(111)-(5x2)-Au reconstruction by Surface X-Ray Diffraction — •Patrick Bayersdorfer¹, Frederic Timmer², Julian Aulbach¹, Henrik Wilkens², Lenart Dudy¹, Joachim Wollschläger², Ralph Claessen¹, Friedrich Reinert¹, and Jörg Schäfer¹ — ¹Universität Würzburg, D-97074 Würzburg — ²Universität Osnabrück, D-49076 Osnabrück

Self-assembled nanowires on semiconductors have recently attracted high attention in terms of one-dimensional (1D) physics. The structural confinement on the order of atomic width gives rise to an enhancement of electron correlation effects, leading to exotic many-body phenomena.

As a prototype of 1D metallic chain systems, the Si(111)-(5x2)-Au reconstruction has been widely studied by a variety of spectroscopic and structural techniques. Particularly, it remains unclear whether or not the superstructure relates to a frozen Peierls distortion or to a structural component. However, the definite structural model is still unknown, although it is of vital importance for a precise understanding of the unusual 1D properties in terms of lattice instabilities or correlation physics.

We present a structural investigation of the Si(111)-(5x2)-Au reconstruction by Surface X-Ray Diffraction (SXRD) yielding the two-dimensional Patterson function, as well as several crystal truncation rods. This will be compared with recent theoretical structural models. In addition, we applied spot-profile low-energy electron diffraction (SPA-LEED) to analyse the morphological aspects of this 1D system.