Dresden 2014 – wissenschaftliches Programm
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SYOM: Symposium One-dimensional Metals: Reality or Fiction
SYOM 2: Posters: One-Dimensional Metals: Reality or Fiction (jointly organized by DS, HL, O, TT)
SYOM 2.13: Poster
Donnerstag, 3. April 2014, 16:00–19:00, P1
Optical and electronic properties of gold nanowires on Si(553) — •Sandhya Chandola1, Eugen Speiser1, Jochen Räthel1, Arne Baumann1, Nobert Esser1, Conor Hogan2, Julian Aulbach3, Sebastian Meyer3, Jörg Schäfer3, and Ralph Claessen3 — 1Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Albert Einstein Strasse 9, 12489 Berlin — 2Institute for Structure of Matter, National Research Council (CNR-ISM), Rome — 3Universität Würzburg, Physikalisches Institut, Am Hubland 97074, Würzburg
Reflectance Anisotropy Spectroscopy (RAS) of the clean Si(553), Si(553)-Au and hydrogenated Si(553)-Au surfaces are measured and compared with density functional theory simulations. The lowest energy reconstruction models of Krawiec [1] are used for the calculations of the structure and optical response. Good agreement between experiment and theory is obtained. Local structural elements such as the Si honeycomb chains and the gold atomic wires, which are usually found on gold reconstructed vicinal Si surfaces, 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. Hydrogen adsorption attenuates the anisotropic response at spectral regions associated with the honeycomb chains at the Si step edges and the gold atomic wires. This combination of experiment and theory is very useful in helping to identify specific structural sites on the surface, which generate distinctive features in the optical response. [1] M. Krawiec, Phys. Rev. B 81, 115436 (2010)