Dresden 2020 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 43: 2D semiconductors and van der Waals heterostructures V (joint session HL/DS/O)

HL 43.8: Vortrag

Mittwoch, 18. März 2020, 11:45–12:00, POT 81

Selectively grown Topological Insulator Nanodevices — •Daniel Rosenbach¹, Abdur Rehman Jalil¹, Jonas Kölzer¹, Nico Oellers¹, Michael Schleenvoigt¹, Tobias Werner Schmitt², Peter Schüffelgen¹, Gregor Mussler¹, Hans Lüth¹, Detlev Grützmacher¹, and Thomas Schäpers¹ — ¹Peter Grünberg Institut (PGI-9) and JARA-Fundamentals of Future Information Technology, Jülich-Aachen Research Alliance, Forschungszentrum Jülich, 52425 Jülich, German — ²JARA-FIT Institute Green IT, RWTH Aachen University, 52062 Aachen, Germany

1-dimensional topological insulator nanoribbons in close proximity to elemental superconductors can be utilized to create localized Majorana modes for topological quantum computation architectures. We employ a selective area growth method using molecular beam epitaxy in order to define topological insulator nanodevices without harmful post processing steps. Using the transmission line method the interface of Bi₂Te₃ nanorribons towards ex situ applied Ti/Au contacts is probed at low temperatures. Furthermore, magnetotransport measurements on nano-Hallbars of down to 50 nm wide Bi₂Te₃ nanoribbons show indications of highly mobile charge carriers originating from 2-dimensional, topological surfaces. Finally, making use of a stencil mask on-chip, elemental superconductors like Nb and Al are deposited to define in situ, lateral topological Josephson junctions. Superconducting properties of proximitized topological nanoribbons are presented and discussed.