Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 18: Metallic Nanowires on Semiconductor Surfaces
O 18.10: Poster
Montag, 7. März 2016, 17:00–19:30, Poster A
Optical properties and electronic doping of quasi-1D gold nanowires on vicinal Si surfaces — •Sandhya Chandola1, Eugen Speiser1, Julian Plaickner1, Conor Hogan2, Julian Aulbach3, Jörg Schäfer3, and Norbert Esser1 — 1Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Department Berlin, Schwarzschildstraße 8, 12489 Berlin, Germany — 2Institute for Structure of Matter, National Research Council (CNR-ISM) Via Fosso del Cavaliere, 00133 Rome, Italy — 3Universität Würzburg, Experimentelle Physik IV, Würzburg
The atomic structures of sub-monolayers of gold on vicinal Si surfaces are currently under intense discussion. Such structures can be investigated in microscopic detail by optical techniques such as Reflection Anisotropy Spectroscopy (RAS), which is extremely sensitive to the 1D nature of these systems. It will be shown that the local electronic properties of these surfaces can be tuned by controlled doping of hydrogen. The optical response of the clean Si(553), Si(553)-Au and hydrogenated Si(553)-Au surfaces are measured with RAS and compared with density functional theory (DFT) simulations. By analysing the optical response of the freshly prepared and hydrogenated Si(553)-Au surfaces, the spectral features can be directly attributed to specific atomic-scale structural elements on the surface. Hydrogen adsorption is shown to attenuate the response at spectral regions associated with the honeycomb chains at the Si step edges. The doping process is reversible and can be used as a controllable parameter to tune the electronic properties of this system.