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 2.12: Poster

Donnerstag, 3. April 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)