Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 12: Topological Insulators 2 (joint session TT/HL)
TT 12.3: Talk
Monday, March 16, 2020, 15:30–15:45, HSZ 103
Experimental evidence for spin-momentum locking in topological insulator nanoribbons — •Jonas Kölzer1, Abdur Rehman Jalil1, Daniel Rosenbach1, Kristof Moors1,2, Dennis Heffels1, Peter Schüffelgen1, Tobias W. Schmitt1,3, Gregor Mussler1, Thomas L. Schmidt2, Detlev Grützmacher1, Hans Lüth1, and Thomas Schäpers1 — 1Peter Grünberg Institut, Forschungszentrum Jülich and JARA Jülich-Aachen Research Alliance, 52425 Jülich, Germany — 2University of Luxembourg, Physics and Materials Science Research Unit,Avenue de la Faïencerie 162a, 1511 Luxembourg, Luxembourg — 3JARA-FIT Institute Green IT, RWTH Aachen University, 52056 Aachen, Germany
Crosses and triple junctions of nanoribbons are at the center of most of the Majorana braiding schemes proposed, since a minimum of three leads is geometrically required for braiding. Topological insulators are a promising class of materials for realizing Majorana states when combined with a superconductor. Making use of these states in a braiding scheme would allow fault tolerant quantum computing. An experimental realization of a Bi2Te3 nanoribbon triple junction which is grown selectively using molecular beam epitaxy is presented. The magnetotransport characteristics of the topological insulator triple junctions at low temperatures are analyzed and compared to the theoretical prediction derived from tight binding transport simulations. The experimental data not only suggests the contribution of surface state transport, but it also provides evidence for spin-momentum locking in topological insulators.