Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 115: Metallic Nanowires on the Atomic Scale (jointly with DS, O)
TT 115.9: Vortrag
Freitag, 20. März 2015, 12:00–12:15, H 2032
Optical and electronic properties of quasi-1D gold nanowires on Si(553) surfaces — •Sandhya Chandola1, Eugen Speiser1, Conor Hogan2, Svetlana Suchkova1, Jochen Räthel1, Julian Plaickner1, and Norbert Esser1 — 1Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Department Berlin, Schwarzschildstrasse 8, 12489 Berlin, Germany — 2Institute for Structure of Matter, CNR-ISM, Via Fosso del Cavaliere, 00133 Rome, Italy
The structures of many 1D metallic nanowire systems have not yet been sufficiently clarified, such as gold nanowires on vicinal Si surfaces. Such structures are intrinsically anisotropic and can be investigated by Reflection anisotropy spectroscopy (RAS) which is a powerful optical technique for probing electronic states of surfaces. The optical response of the Si(553)-Au and hydrogenated Si(553)-Au surfaces are measured with RAS and compared with density functional theory simulations. Good agreement between experiment and theory is obtained. Local structural elements such as the Si honeycomb chains and the gold atomic wires, yield distinctive features in the optical spectra. By comparing the optical response of the freshly prepared and hydrogenated Si(553)-Au surfaces, the spectral features can be directly attributed to particular structural elements on the surface. This combination of experiment and theory is very useful in identifying specific structural sites on the surface, which generate distinctive features in the optical response. The surface will be used to attach molecules such as 3,4-toluenedithiol. The ordered array of the molecules could act as a template for further functionalization.