Artificial topological insulator realized in a two-terminal Josephson junction with Rashba spin-orbit interaction

Artificial topological insulator realized in a two-terminal Josephson junction with Rashba spin-orbit interaction

We study a two-terminal Josephson junction with conventional superconductors and a normal region with Rashba spin-orbit interaction, characterized by two Aharonov-Casher (AC) fluxes. When the superconducting phase difference equals $\pi$, the Andreev subgap spectrum may host zero-energy Weyl singula...

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Hauptverfasser: Medic, Luka, Ramšak, Anton, Rejec, Tomaž
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Physics - Mesoscale and Nanoscale Physics
Physics - Superconductivity
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Ramšak, Anton
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description We study a two-terminal Josephson junction with conventional superconductors and a normal region with Rashba spin-orbit interaction, characterized by two Aharonov-Casher (AC) fluxes. When the superconducting phase difference equals $\pi$, the Andreev subgap spectrum may host zero-energy Weyl singularities associated with a vanishing normal-state reflection eigenvalue. With one of the AC fluxes playing the role of a quasimomentum, the junction can be viewed as an artificial one-dimensional chiral topological insulator. Its topological phase can be tuned by crossing a Weyl singularity by means of varying the remaining AC flux. By associating an additional component of the quasimomentum with the superconducting phase difference, an artificial Chern insulator is realized.
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title Artificial topological insulator realized in a two-terminal Josephson junction with Rashba spin-orbit interaction
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