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001     1053014
005     20260202125355.0
037 _ _ |a FZJ-2026-01358
041 _ _ |a English
100 1 _ |a Schäpers, Thomas
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111 2 _ |a 10th International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies
|g EM-Nano
|c Fukui
|d 2025-06-11 - 2025-06-14
|w Japan
245 _ _ |a Superconductive coupling and diode effect in topological insulator-based multi-terminal Josephson junctions
260 _ _ |c 2025
336 7 _ |a Conference Paper
|0 33
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336 7 _ |a Other
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336 7 _ |a INPROCEEDINGS
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336 7 _ |a Conference Presentation
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520 _ _ |a 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.
536 _ _ |a 5222 - Exploratory Qubits (POF4-522)
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536 _ _ |a DFG project G:(GEPRIS)390534769 - EXC 2004: Materie und Licht für Quanteninformation (ML4Q) (390534769)
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536 _ _ |a DFG project G:(GEPRIS)491798118 - Magnetische topologische Isolatoren für robuste Majorana Zustände (491798118)
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650 2 7 |a Condensed Matter Physics
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650 1 7 |a Information and Communication
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856 4 _ |u https://em-nano2025.jp/
909 C O |o oai:juser.fz-juelich.de:1053014
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910 1 _ |a Forschungszentrum Jülich
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980 _ _ |a UNRESTRICTED

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