Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 50: Poster: Nanostructures on Surfaces II

O 50.3: Poster

Dienstag, 13. März 2018, 18:15–20:30, Poster B

Atomic-scale Au chains on Si(553): Influence of Defects — •Christian Braun and Wolf Gero Schmidt — Universität Paderborn, Paderborn, Germany

One-dimensional atomic-scale metallic nanowires are popular model systems to study phenomena of one-dimensional physics such as Peierls instabilities, spin-charge separation, and charge-density waves [1]. Defects may be used to tune the nanowire properties, e.g., the electron transport or phase transition temperature. Recently it was shown that additional Si adatoms on Si(775)-Au induce local spin-polarization at the step [2]. In the present work the influence of Si adatoms and small molecules on the atomic structure and electronic properties of Si(553)-Au is investigated. For that purpose, density functional theory calculations are combined with ab initio thermodynamics. We discuss the defect impact on the Au chain dimerization, electronic band structure and predict desorption temperatures for foreign adsorbates.

[1] T Frigge, B Hafke, T Witte, B Krenzer, C Streubühr, A Samad Syed, V Miksic Trontl, I Avigo, P Zhou, M Ligges, D von der Linde, U Bovensiepen, M Horn-von Hoegen, S Wippermann, A Lücke, S Sanna, U Gerstmann, WG Schmidt, Nature 544, 207 (2017)

[2] J Aulbach, SC Erwin, R Claessen, J Schäfer, Nano Letters 16, 2698-2704 (2016)