Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 22: Nanostructures at Surfaces II
O 22.8: Vortrag
Montag, 11. März 2013, 17:45–18:00, H45
Optical Anisotropy Spectroscopy of metallic Nanowires on vicinal Semiconductor Surfaces — •Jochen Räthel1, Eugen Speiser1, Sebastian Meyer2, Julian Aulbach2, Lenart Dudy2, Jörg Schäfer2, Daniel Lükermann3, Ulrich Krieg3, Christoph Tegenkamp3, and Norbert Esser1 — 1Leibniz-Institut für Analytische Wissenschaften – ISAS – e.V., Albert-Einstein-Str. 9, 12489 Berlin — 2Universität Würzburg, Physikalisches Institut, Am Hubland, 97074 Würzburg — 3Institut für Festkörperphysik, Leibniz-Universität Hannover, Appelstraße 2, 30167 Hannover
Metals adsorbed on semiconductor surfaces allow a variety of different surface reconstructions. Among them are one-dimensional structures, often denoted as atomic quantum chains, which preferably grow on vicinal substrates. These chains host exotic electronic ground states, e.g. a charge-density wave state reported for In on Si(111) and Au on Si(553), a insulator-to-metal transition in In on Si(111) and Pb on Si(557) or the rare Tomonaga-Luttinger liquid phase in Au on Ge(001). This talk will briefly introduce these four types of wires from their optical properties as deduced from reflection anisotropy spectroscopy (RAS) of linear polarized light at normal incidence. The response gives access to optical transitions within the band structure from the IR to the UV spectral range. Combined with calculated optical spectra by ab-initio density functional theory the experimental data provide a bases for structural modeling of these complex surface reconstructions [PRL 102, 226805 (2009)].