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O: Fachverband Oberflächenphysik

O 42: Nanostructures at surfaces I

O 42.6: Talk

Wednesday, March 28, 2012, 11:45–12:00, MA 042

Structural Elements of Gold-Induced Atomic Chains on Ge(001) — •Sebastian Meyer¹, Jörg Schäfer¹, Christoph Loho¹, Christian Blumenstein¹, Simeon Sauer², Friedhelm Bechstedt³, Phil Willmott⁴, and Ralph Claessen¹ — ¹Physikalisches Institut, Universität Würzburg — ²Institut für Physik, nivserität Freiburg — ³Inst. f. Festkörpertheorie u. -optik, Universität Jena — ⁴Paul Scherrer Institut, Villigen CH

Self-organized nanowires of gold on Ge(001) are outstanding among all previously reported atom chains because their electronic states are found to deviate from the common Fermi liquid picture. In contrast, the exotic many-body state of a Tomonaga-Luttinger liquid applies. Characteristic features are observed in terms of power-law suppression of the density of states towards the chemical potential in scanning tunneling spectroscopy and angle-resolved photoemission [1]. For a detailed understanding an atomistic model is highly desirable, enabling band structure calculations within density functional theory (DFT). Thus, we have performed surface x-ray diffraction (SXRD) at the Swiss Light Source. The Patterson map resulting from in-plane scattering data yields interatomic distances which are required for structural modeling. Comparison of SXRD with recent STM data reveals essential structural building blocks which are compatible with present DFT calculations.

[1] C. Blumenstein et al., Nat. Phys. 7, 776 (2011).