%0 Conference Paper
%A Schäpers, Thomas
%T Superconductive coupling and diode effect in topological insulator-based multi-terminal Josephson junctions
%M FZJ-2026-01358
%D 2025
%X The combination of s-type superconductors with three-dimensional topological insulators creates a promising platform for fault-tolerant topological quantum circuits based on Majorana braiding. The backbone of the braiding mechanism is a three-terminal Josephson junction. Implementing this concept requires a deeper understanding of the underlying mechanisms in topological insulator nanoribbon networks equipped with superconducting electrodes. The samples for our experiments are fabricated by a combination of selective-area growth of the topological insulator and shadow mask evaporation of the superconductor. As a first step, we investigate nanoribbon kinks and T-junctions of the topological insulator. In kink structures, a π-periodic change of the conductance is observed as a function of the angle of an in-plane magnetic field. We attribute this phenomenon to an orbital effect leading to an alignment or misalignment of the phase-coherent states on the lower and upper surfaces of the kink branches depending on the magnetic field orientation. The experimental results are supported by a theoretical analysis based on a surface Rashba-Dirac model and tight-binding simulations. As a next step, the transport properties of topological insulator-based three-terminal Josephson junctions are measured and the cross-coupling of the junctions is analyzed. Under the application of an out-of-plane magnetic field, a multi-terminal geometry induced diode effect is observed.Work done in collaboration with: Gerrit Behner, Abdur Rehman Jalil, Kristof Moors, Michael Schleenvoigt, Jonas Kölzer, Erik Zimmermann, Daniel Rosenbach, Alina Rupp, Gregor Mussler, Peter Schüffelgen, Hans Lüth, Detlev Grützmacher.
%B 10th International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies
%C 11 Jun 2025 - 14 Jun 2025, Fukui (Japan)
Y2 11 Jun 2025 - 14 Jun 2025
M2 Fukui, Japan
%F PUB:(DE-HGF)6
%9 Conference Presentation
%U https://juser.fz-juelich.de/record/1053014