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HL: Fachverband Halbleiterphysik

HL 14: Topological Insulators 2 (jointly with DS, MA, HL, O) (joint session TT/HL)

HL 14.3: Vortrag

Montag, 16. März 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 Moors^1,2, Dennis Heffels¹, Peter Schüffelgen¹, Tobias W. Schmitt^1,3, 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.