Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 50: HL Poster IV

HL 50.19: Poster

Thursday, March 15, 2018, 19:00–21:00, Poster B

Fabrication of bulk-insulating topological insulator nanowires — •Matthias Rößler, Dingxun Fan, Andrea Bliesener, Zhiwei Wang, Alexey Taskin, and Yoichi Ando — Institute of Physics II - University of Cologne

With proximity-induced superconductivity, bulk-insulating topological insulator nanowires are expected to serve as a robust platform for realizing Majorana bound states. When exploiting their non-Abelian exchange statistics, these could enable realizations of topological quantum computation schemes. In previous reports, however, finite bulk transport contribution yet showed potential for improvements. To tackle this issue, we have been performing fabrication and optimization of bulk-insulating nanowires through two different approaches:

1) Naturally grown (Bi_1−xSb_x)₂Te₃ and Bi₂Te₂Se nano-wires prepared by a vapor-solid method.

2) Nanowires etched from bulk-insulating exfoliated Bi_2−xSb_xTe_3−ySe_y nanoribbons or MBE-grown (Bi_1−xSb_x)₂Te₃ thin films.

By using chemical wet etching, nano-ribbons with a diameter of down to 100 nm have been prepared. Magneto-transport measurements have been carried out to characterize their properties such as carrier density and mobility. Once bulk-insulating topological insulator nanowires have been obtained, they will be utilized for studying proximity-induced superconductivity.