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DS: Fachverband Dünne Schichten
DS 45: Poster IV: One-Dimensional Metals: Reality or Fiction
DS 45.12: Poster
Thursday, April 3, 2014, 16:00–19:00, P1
Raman Spectroscopy of gold-induced nanostructures on plain and high index Si(111) — •Jochen Räthel1, Eugen Speiser1, Sandhya Chandola1, Arne Baumann1, Norbert Esser1, Julian Aulbach2, Sebastian Meyer2, Utz Bass2, Martin Liebhaber2, Lenart Dudy2, Jean Geurts2, Jörg Schäfer2, and Ralph Claessen2 — 1Leibniz-Institut für Analytische Wissenschaften – ISAS – e.V., Albert-Einstein-Str. 9, 12489 Berlin — 2Physikalisches Institut and RCCM, Universität Würzburg, Physikalisches Institut, Am Hubland, 97074 Würzburg
Atomic chains formed by metal adsorption on semiconductor surfaces are used as model systems for determining exotic electronic ground states. Here we present the vibrational properties of Au-induced nanostructures on Si(111) ((√3×√3) and (5×2) phase) and on Si(553) (local (5×2) phase), probed by polarized Raman spectroscopy (RS). Plenty of new surface vibration modes were identified for all three Au related surfaces. By comparing the results from RS of these three Au phases under consideration of different substrates, common structural elements were identified. These results could have a high impact on the verification of theoretical structures models of these systems, e.g., the lowest-energy reconstruction models of Krawiec [1] and the structural model of Erwin and Himpsel [2]. [1] M. Krawiec, Phys. Rev. B 81, 115436 (2010); [2] S. C. Erwin, Nat Commun 1, 58 (2010)