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@INPROCEEDINGS{Schpers:1053014,
      author       = {Schäpers, Thomas},
      title        = {{S}uperconductive coupling and diode effect in topological
                      insulator-based multi-terminal {J}osephson junctions},
      reportid     = {FZJ-2026-01358},
      year         = {2025},
      abstract     = {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.},
      month         = {Jun},
      date          = {2025-06-11},
      organization  = {10th International Symposium on
                       Organic and Inorganic Electronic
                       Materials and Related Nanotechnologies,
                       Fukui (Japan), 11 Jun 2025 - 14 Jun
                       2025},
      subtyp        = {Invited},
      cin          = {PGI-9},
      cid          = {I:(DE-Juel1)PGI-9-20110106},
      pnm          = {5222 - Exploratory Qubits (POF4-522) / DFG project
                      G:(GEPRIS)390534769 - EXC 2004: Materie und Licht für
                      Quanteninformation (ML4Q) (390534769) / DFG project
                      G:(GEPRIS)491798118 - Magnetische topologische Isolatoren
                      für robuste Majorana Zustände (491798118)},
      pid          = {G:(DE-HGF)POF4-5222 / G:(GEPRIS)390534769 /
                      G:(GEPRIS)491798118},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/1053014},
}