Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.17: Poster
Tuesday, March 27, 2012, 18:15–21:45, Poster B
Tomonaga-Luttinger Liquid Behavior in Au/Ge(001) Nanowires — •Sebastian Mietke1, Christian Blumenstein2, Jörg Schäfer2, Sebastian Meyer2, Michael Lochner1, René Matzdorf1, and Ralph Claessen2 — 1Fachbereich Naturwissenschaften, Experimentalphysik II, Universität Kassel, 34132 Kassel, Germany — 2Physikalisches Institut, Universität Würzburg, 97074 Würzburg, Germany
Atomic nanowires formed by self-organization of metal adatoms on semiconductor surfaces offer a vast playground for physics in low dimensions. Recently, Au-induced chains on Ge(001) have been found to exhibit Tomonaga-Luttinger liquid behavior (TLL) [1], which has not been found in a surface system before. Here we scrutinize the electronic properties of these Au chains by scanning tunneling spectroscopy (STS) and angle-resolved photoemission (ARPES) over a wide temperature range. Density of states maps reveal a 1D conduction path in real space, thereby clearly identifying conducting filaments in chain direction over a wide energy range. A power-law behavior upon energy is found in the density of states, characteristic of a TLL. The corresponding exponent α is found independently by both STS and ARPES. Furthermore, universal scaling behavior is observed as a hallmark of TLL physics. This renders the Au/Ge(001) chains the first TLL system at a surface, opening new possibilities to probe modified interactions from specific atomic configurations. [1] Nature Physics, Vol. 7, 776-780 (Oct. 2011).