Anomalous supercurrent and diode effect in locally perturbed topological Josephson junctions
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866917692019048448 |
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| author | Fracassi, Samuele Traverso, Simone Ziani, Niccolò Traverso Carrega, Matteo Heun, Stefan Sassetti, Maura |
| author_facet | Fracassi, Samuele Traverso, Simone Ziani, Niccolò Traverso Carrega, Matteo Heun, Stefan Sassetti, Maura |
| contents | The simultaneous breaking of time-reversal and inversion symmetry can lead to peculiar effects in Josephson junctions, such as the anomalous Josephson effect or supercurrent rectification, which is a dissipationless analog of the diode effect. Due to their impact in new quantum technologies, it is important to find robust platforms and external means to manipulate the above effects in a controlled way. Here, we theoretically consider a Josephson junction based on a quantum spin Hall system as the normal channel, subjected to a magnetic field in the direction defined by spin-momentum locking, and in presence of a local tip in close proximity to one of the metallic edges in the normal region. We consider different local perturbations, model normal and magnetic tips, and study how they affect the Josephson response of the device. In particular, we argue that magnetic tips are a useful tool that allows for tunability of both $ϕ_0$ response and supercurrent rectification. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_17894 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Anomalous supercurrent and diode effect in locally perturbed topological Josephson junctions Fracassi, Samuele Traverso, Simone Ziani, Niccolò Traverso Carrega, Matteo Heun, Stefan Sassetti, Maura Superconductivity The simultaneous breaking of time-reversal and inversion symmetry can lead to peculiar effects in Josephson junctions, such as the anomalous Josephson effect or supercurrent rectification, which is a dissipationless analog of the diode effect. Due to their impact in new quantum technologies, it is important to find robust platforms and external means to manipulate the above effects in a controlled way. Here, we theoretically consider a Josephson junction based on a quantum spin Hall system as the normal channel, subjected to a magnetic field in the direction defined by spin-momentum locking, and in presence of a local tip in close proximity to one of the metallic edges in the normal region. We consider different local perturbations, model normal and magnetic tips, and study how they affect the Josephson response of the device. In particular, we argue that magnetic tips are a useful tool that allows for tunability of both $ϕ_0$ response and supercurrent rectification. |
| title | Anomalous supercurrent and diode effect in locally perturbed topological Josephson junctions |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2403.17894 |