Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)

O 41.86: Poster

Dienstag, 23. März 2010, 18:30–21:00, Poster B1

Electronic Properties of Gold Chains on Ge(001) by Angle-resolved Photoemission — •Andreas Dollinger¹, Thorsten Umbach¹, Sebastian Meyer¹, Jörg Schäfer¹, Christian Blumenstein¹, Philipp Höpfner¹, Xiaoyu Cui², Luc Patthey², and Ralph Claessen¹ — ¹Experimentelle Physik 4, Universität Würzburg, 97074 Würzburg, Germany — ²Swiss-Light-Source, Paul-Scherrer-Institut, 5232 Villigen, Switzerland

Metallic nanowires formed by adatom adsorption on semiconductor surfaces have established themselves as playground for studying phenomena in low dimensions. A key requisite is their spatial confinement where charge is mostly maintained within the chain architecture. Examples known are, e.g., Au and In on silicon surfaces, where a charge density wave (CDW) is discussed as the low-temperature ground state. Here finite interchain coupling stabilizes the Peierls state and seemingly hinders a stricter one-dimensional regime. In contrast, Au nanowires on Ge(001) are an alternative system where the chains are well separated by several substrate lattice constants. The electronic band structure from angle-resolved photoemission (ARPES) reveals metallic states, persisting down to low temperatures. No structural change, such as a CDW, is observed when cooling to liquid helium temperatures, which allows the search for deviations from the Fermi liquid picture. Variation of photon energies reveals a great variety of bands within the periodicity of the surface reconstruction. We will present high-resolution data on the band topology, as well as an analysis of the spectral properties near the Fermi level.