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Reflectionless modes as a source of Weyl nodes in multiterminal Josephson junctions

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2025

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https://doi.org/10.48550/arXiv.2503.10874
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http://arxiv.org/abs/2503.10874

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Deutsche Forschungsgemeinschaft (DFG): SFB 1432, 425217212

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Multiterminal Josephson junctions are a promising platform to study non-trivial topology in engineered quantum systems. Yet, experimentally meaningful insight into what exactly makes these systems topologically non-trivial remains elusive. In this work, we show that zero energy reflectionless scattering modes (RSMs) of the normal scattering matrix result in topological phase boundaries. By analyzing two different setups, we explain the origin of each topological phase boundary and furthermore provide generalizable insight into these systems. The considerations here can be of help for experimentalists as it connects the properties of the normal scattering region to the Andreev bound state spectrum of superconducting junctions in a multiterminal setup.

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530 Physik

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Mesoscale and Nanoscale Physics, Weyl node, Josephson junction, quantum system, superconductivity, RSMs

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ISO 690OHNMACHT, David, Valentin WILHELM, Wolfgang BELZIG, 2025. Reflectionless modes as a source of Weyl nodes in multiterminal Josephson junctions
BibTex
@unpublished{Ohnmacht2025-03-13Refle-73987,
  title={Reflectionless modes as a source of Weyl nodes in multiterminal Josephson junctions},
  year={2025},
  doi={10.48550/arXiv.2503.10874},
  author={Ohnmacht, David and Wilhelm, Valentin and Belzig, Wolfgang}
}
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