Dresden 2017 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 56: Poster Session: Low-Dimensional Systems
TT 56.7: Poster
Wednesday, March 22, 2017, 15:00–19:00, P2-OG4
Edge states at zigzag edges of Bi honeycomb bilayers on Nb(110) — •Fang Yang1, Jasmin Jandke1, Tim Storbeck1, Timofey Balashov1, Anuva Aishwarya2, and Wulf Wulfhekel1 — 1Physikalisches Institut, Karlsruhe Institute of Technology, Wolfgang-Gaede Str. 1, 76131 Karlsruhe, Germany — 2Indian Insitute of Science, Bangalore, India
Islands of Bi showing (110)- and (111)-orientated facets were grown on Nb(110) and were studied with STM at low temperatures. On the (111) facets, both bilayer steps of zig-zag termination display topological edge states in contrast to that of single bilayer step-edges on bulk Bi. This is evidenced by locally resolved density-of-states near the edges revealing the characteristic distribution of edge states, i.e. dangling bond states and bulk-derived topological edge states. Further, we investigated the charge distribution of the surface state electrons on the Bi(110) surface. We find that the electronic states are highly anisotropic within the unit cell forming one dimensional stripes. Our findings indicate a causal link between the Bi(111) edge states and Bi(110) surface states as they are both related to the zig-zag termination of the honeycomb structure of Bi.