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Nontrivial Chern Numbers in Three-Terminal Josephson Junctions
Julia S Meyer1, Manuel Houzet1
1Univ. Grenoble Alpes, CEA, INAC-Pheliqs, 38000 Grenoble, France.
Physical Review Letters
|January 18, 2018
Summary
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.
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.
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