Dresden 2014 – scientific programme

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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 2.14: Poster

Thursday, April 3, 2014, 16:00–19:00, P1

Optical and vibrational characterization of gold-induced atomic wires on germanium (001) — •Jochen Räthel¹, Eugen Speiser¹, Sandhya Chandola¹, Arne Baumann¹, Norbert Esser¹, Utz Bass², Jean Geurts², Sebastian Meyer², Julian Aulbach², Lenart Dudy², 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 known as model systems for determining exotic electronic ground states, such as the Tomonaga-Luttinger liquid (TTL). A system of Au-induced atomic wires on the Ge(001) surface has been reported to host such TTL behaviour [1]. Here we present the results of temperature dependent reflection anisotropy spectroscopy (RAS) and Raman spectroscopy (RS) on clean Ge(001) and Au/Ge(001). RAS probes optically surface and surface to bulk electronic transitions between 0.5 and 5 eV with linear polarized light at normal incidence. From polarized RS measurements the vibrational properties of clean Ge(001) and Au/Ge(001) were characterized and in particular surface phonon modes identified. In combination with calculated ab-initio optical and vibrational spectra , the experimental data from RS and RAS provide a basis for structural modeling of these complex surface reconstructions. [1] C. Blumenstein, Nat. Phys. 7, 776 (2011)