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Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 10: Focus Session: Evolution of Topological Materials into Superconducting Nanodevices I (joint session HL/TT)

HL 10.1: Vortrag

Montag, 18. März 2024, 15:00–15:15, EW 202

Transport studies in selectively grown topological insulator multiterminal Josphson junctions — •Gerrit Behner1,2, Alina Rupp1,2, Abdur Rehman Jalil1,2, Kristof Moors1,2, Dennis Heffels1,2, Detlev Grützmacher1,2, and Thomas Schäpers1,21Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany — 2Jara-Fundamentals of Future Information Technology, Forschungszentrum Jülich and RWTH Aachen University, Germany

The combination of an ordinary s-type superconductor with three-dimensional topological insulators creates a promising platform for fault tolerant topological quantum computing circuits based on Majorana braiding. The backbone of the braiding mechanism are three terminal Josephson junctions. It is crucial to understand the transport in these devices for further use in quantum computing applications. We present low-temperature measurements of three-terminal Bi0.8Sb1.2Te3 Josephson junctions fabricated, based on a combination of selective area growth and shadow mask evaporation. The transport properties of the junction are mapped out as a function of bias current and magnetic field. The bias current maps reveal a variety of transport phenomena, i.e. multiple Andreev reflections suggesting the successful fabrication of a fully coupled three-terminal junction. The junctions seem to be in good agreement with a resistively and capacitively shunted junction model, but also reveal the influence of intrinsic asymmetries and their effect on the transport in the junctions.

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