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| Home > Publications database > Superconductive Coupling and Josephson Diode Effect in Topological Insulator-Based Multi-Terminal Hybrid Structures |
| Home > Publications database > Superconductive Coupling and Josephson Diode Effect in Topological Insulator-Based Multi-Terminal Hybrid Structures |
| Conference Presentation (Invited) | FZJ-2024-06283 |
2024
Abstract: The combination of s-type superconductors with three-dimensional topological insulators creates apromising platform for fault-tolerant topological quantum circuits based on Majorana braiding. Thebackbone of the braiding mechanism is a three-terminal Josephson junction. To implement this concept,a deeper understanding of the underlying mechanisms in topological insulator nanoribbon networksequipped with superconducting electrodes is required. The samples for our experiments are fabricatedby a combination of selective area growth of the topological insulator and shadow mask evaporation ofthe superconductor. As a first step, we investigate nanoribbon kinks and T-junctions of the topologicalinsulator [1,2]. In kink structures, a π-periodic change of the conductance is observed as a function ofthe angle of an in-plane magnetic field. We attribute this phenomenon to an orbital effect leading to analignment or misalignment of the phase-coherent states on the lower and upper surfaces of the kinkbranches depending on the magnetic field orientation. The experimental results are supported by atheoretical analysis based on a surface Rashba-Dirac model and tight-binding simulations. As a nextstep, the transport properties of topological insulator-based three-terminal Josephson junctions aremapped and the cross-coupling of the junctions is analyzed. Under the application of an out-of-planemagnetic field, a multi-terminal geometry induced diode effect is observed.start here. Only one pageabstract including figures and references.Work done in collaboration with: Gerrit Behner, Abdur Rehman Jalil, Kristof Moors, MichaelSchleenvoigt, Jonas Kölzer, Erik Zimmermann, Alina Rupp, Peter Schüffelgen, Hans Lüth, DetlevGrützmacher.References[1] Kölzer, J.; Jalil, A. R.; Rosenbach, D.; Arndt, L.; Mussler, G.; Schüffelgen, P.; Grützmacher,D.; Lüth, H., Schäpers, T. Supercurrent in Bi4Te3 topological material-based three-terminaljunctions, Nanomaterials, 13, 293 (2023)[2] Behner, G.; Moors, K.; Zhang, Y.; Schleenvoigt, M.; Rupp, A.; Zimmermann, E.; Jalil, A. R.;Schüffelgen, P.; Lüth, H.; Grützmacher, D., Schäpers, T. In-plane magnetic field drivenconductance modulations in topological insulator kinks, Phys. Rev. B, 109, 155429 (2024)
Keyword(s): Information and Communication (1st) ; Condensed Matter Physics (2nd)
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