Regensburg 2022 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 19: Materials and Devices for Quantum Technology 1
HL 19.7: Talk
Wednesday, September 7, 2022, 11:45–12:00, H34
Topological insulator based axial DC SQUID quantum interferometer structure — •Erik Zimmermann1,2, Benedikt Frohn1,2, Jan Karthein1,2, Gerrit Behner1,2, Abdur Rehman Jalil1,2, Tobias Schmitt2,3, Michael Schleenvoigt1,2, Gregor Mussler1,2, Peter Schüffelgen1,2, Hans Lüth1,2, Detlev Grützmacher1,2,3, and Thomas Schäpers1,2 — 1Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany — 2JARA-Fundamentals of Future Information Technology, Jülich-Aachen Research Alliance, Forschungszentrum Jülich and RWTH Aachen University, Germany — 3Peter Grünberg Institut (PGI-10), Forschungszentrum Jülich, 52425 Jülich, Germany
Three-dimensional topological insulators (TIs) form a new material class that may enable robust topological quantum computing when combining them with a superconductor by using so-called Majorana zero modes. Recently, Josephson junctions and SQUIDs using a TI as a weak link are investigated for interface characterization. We present the in-situ fabrication of an interferometer structure formed by an axial DC SQUID that is based on a ternary TI with a Bi0.18Sb1.82Te3 composition. For the in-situ fabrication shadow mask techniques and selective area growth by molecular beam epitaxy are used. Furthermore, magnetotransport measurements are shown, revealing induced superconductivity in both Josephson junctions and an in-plane magnetic field dependent interference pattern corresponding to SQUID oscillations. Lastly, the Shapiro response of the device is investigated.