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Topological transitions in Josephson junctions can be controlled by magnetic flux. This study demonstrates tuning Weyl singularities in three-terminal Josephson junctions using magnetic flux, offering new insights into topological phase transitions.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials

Background:

  • Andreev bound states in Josephson junctions can exhibit zero-energy Weyl singularities.
  • These singularities are linked to topological transitions between time-reversal symmetry broken phases.

Purpose of the Study:

  • To investigate topological transitions in three-terminal Josephson junctions.
  • To demonstrate tuning of Weyl singularities using magnetic flux.

Main Methods:

  • Theoretical analysis of the Andreev bound state spectrum.
  • Utilizing a three-terminal Josephson junction geometry.
  • Applying magnetic flux as a control parameter.

Main Results:

  • Topological transitions and Weyl singularities can be tuned by magnetic flux in a three-terminal geometry.
  • This provides an alternative method to control topological phase transitions compared to previous studies using superconducting phase.

Conclusions:

  • Magnetic flux is a viable parameter for tuning topological transitions in Josephson junctions.
  • The findings expand the understanding of topological phenomena in superconducting systems.