Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 19: Topology: Majoranas

FM 19.5: Talk

Montag, 23. September 2019, 17:45–18:00, 1199

Fully in situ fabricated Josephson devices via the Jülich process — •Peter Schüffelgen¹, Daniel Rosenbach¹, Chuan Li², Tobias W. Schmitt¹, Michael Schleenvoigt¹, Benjamin Bennemann¹, Lidia Kibkalo¹, Martina Luysberg¹, Gregor Mussler¹, Erwin Berenschot², Niels Tas², Alexander A. Golubov², Alexander Brinkman², Thomas Schäpers¹, and Detlev Grützmacher¹ — ¹Peter Grünberg Institute, Forschungszentrum Jülich — ²MESA+ Institute, University of Twente

Networks of topological insulator (TI) nanostructures in proximity to superconductors (S) have been predicted to provide a platform for topologically protected quantum computing. A combination of selective area growth and stencil lithography allowed us to fabricate Nb−(Bi,Sb)₂Te₃ S-TI hybrid devices fully under ultra-high vacuum conditions. The so-called Jülich process yields highly transparent S-TI interfaces and provides a protective capping layer to the devices before they are exposed to ambient conditions. Measurements on as-prepared Josephson junctions show signatures of Majorana bound states. By restricting TI growth to selected areas only, it is possible to move from single Josephson junctions towards complex circuitry for future topological quantum computation architectures.