Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 17: Materials and devices for quantum technology I

HL 17.3: Talk

Monday, March 16, 2020, 15:30–15:45, POT 112

Fabrication of Topological Insulator Tunnel Junctions — •Dennis Heffels¹, Tobias W. Schmitt^1,2, Michael Schleenvoigt¹, Kristof Moors¹, Max Vassen-Carl¹, Florian Lentz¹, Benjamin Bennemann¹, Gregor Mussler¹, Peter Schüffelgen¹, and Detlev Grützmacher^1,2 — ¹Peter Grünberg Institute, Forschungszentrum Jülich — ²JARA-FIT Institute Green IT, RWTH Aachen University

At the end of a one-dimensional topological superconductor Majorana zero modes are predicted to exist. As a possible platform for this exotic superconductivity, heterostructures of (Bi_xSb_1−x)₂Te₃ 3D topological insulators (3D TIs) and s-wave superconductors are currently investigated. For this, tunneling spectroscopy is a powerful tool in order to characterize the superconducting proximity effect and detect signatures of Majorana zero modes as shown already on other hybrid platforms like proximitized III-V semiconductor nanowires. A major challenge in order to use this techique also for 3D TI nanoribbons is the fabrication of suitable tunnel junctions while simultaneously preventing the delicate 3D TI surface from degradation at ambient conditions. In this contribution, I will report on progress of a multi-step in situ fabrication technique to assemble tunnel junctions at the ends of proximitized 3D TI nanoribbons.