Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 63: Focus Session: Charge Transport at Surfaces and Nanostructures with Multi-probe Techniques
O 63.11: Poster
Dienstag, 21. März 2017, 18:30–20:30, P2-OG3
Transport on Si(553)-Au and Si(557)-Au atomic chains: The effect of oxygen adsorption — Frederik Edler1, Ilio Miccoli1, •Jan P. Stöckmann1, Herbert Pfnür1, Christian Braun2, Simone Sanna2, Wolf G. Schmidt2, and Christoph Tegenkamp1 — 1Universität Hannover, 30167 Hannover — 2Universität Paderborn, 33098 Paderborn
Atomic chain ensembles grown by self-assembly are prototype 1D systems with partly outstanding electronic properties such as Peierls instabilities or dimensional crossover from Fermi to Luttinger liquid behavior. Recently [1], the Au-induced atomic chain structures on Si(hhk) attracted a lot of attention. The strong spin-orbit coupling gives rise to spin polarized surface bands and in case of Si(553)-Au even quantum spin liquid behavior. However, such properties can strongly be altered by imperfections, e.g. defects induced by adsorbates. In this contribution, we present a systematic study of the transport properties of Si(553)-Au and Si(557)-Au system by means of a 4-tip STM system in combination with SPALEED tuned by adsorption of molecular oxygen. Our DFT calculations show that the origin of metallic surface bands along the wires of similar Si(hhk)-Au surfaces are strongly dependent on the structure of Au chains, Si-adatom chains and Si edges. Here we see an inert behavior for the Si(553)-Au surface while a strong decrease in the conduction along the chains is present for the Si(557)-Au.
[1] B. Hafke et al., Phys. Rev. B 94 (2016) p. 161403