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Josephson matter with phase-engineered topology

Magnus Lykkegaard, Niels Bohr Institute, University of Copenhagen
Thursday, May 1, 2025 - 12:30pm to 1:30pm
PAB B421

Josephson junctions with two superconducting leads are the key component in superconducting quantum devices. In multi-terminal Josephson setups, the phase differences between superconducting leads play a role similar to momenta (quasi-momenta), enabling us to phase-engineer bandstructures formed by Andreev bound states, and control the resulting topology.  By tuning the phase-differences without applying a magnetic field, one can control interference effects while keeping time-reversal symmetry intact in the junction. Interestingly, a chain of Josephson junctions connected via quantum dots behave like a single multi-terminal junction, highlighting a surprising link between different device architectures, and paves the way for easier control and fabrication.

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