Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 29: Metallic nanowires on semiconductor surfaces
O 29.5: Talk
Tuesday, March 13, 2018, 11:30–11:45, MA 144
Chiral topological solitons in the Si(111)-(8x2)In atomic wire array — Samad Razzaq1, Tae-Hwan Kim2, Han Woong Yeom2, and •Stefan Wippermann1 — 1Max-Planck-Institut für Eisenforschung — 2Pohang University
The Si(111)-(8x2)In atomic wire array is a prototypical system featuring a one-dimensional charge density wave (CDW) formed at low temperature at the surface. As a consequence of CDW formation, the (8x2) phase exhibits a band inversion in the surface band structure. This system is therefore a candidate for a 1D topological insulator. Recent experimental findings indicate that the associated topological edge states take the form of chiral topological solitons. At present, these results, the associated concepts and their applicability with respect to atomic wires are intensely debated. In this talk we review the fundamental ideas behind the topological solitons in this system. We discuss how to understand the nature of the solitons and their interactions within phonon theory from first principles and provide some recent atomistic insights. Financial support from the German Research Foundation (DFG), grant no. FOR1700 is gratefully acknowledged.