Spontaneous supercurrents and vortex depinning in two-dimensional arrays of $φ_0$-junctions
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866914175153864704 |
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| author | Reinhardt, Simon Penner, Alexander-Georg Berger, Johanna Baumgartner, Christian Gronin, Sergei Gardner, Geoffrey C. Lindemann, Tyler Manfra, Michael J. Glazman, Leonid I. von Oppen, Felix Paradiso, Nicola Strunk, Christoph |
| author_facet | Reinhardt, Simon Penner, Alexander-Georg Berger, Johanna Baumgartner, Christian Gronin, Sergei Gardner, Geoffrey C. Lindemann, Tyler Manfra, Michael J. Glazman, Leonid I. von Oppen, Felix Paradiso, Nicola Strunk, Christoph |
| contents | Two-dimensional arrays of ballistic Josephson junctions are important as model systems for synthetic quantum materials. Here, we investigate arrays of multiterminal junctions which exhibit a phase difference $φ_0$ at zero current. When applying an in-plane magnetic field we observe nonreciprocal vortex depinning currents. We explain this effect in terms of a ratchet-like pinning potential, which is induced by spontaneous supercurrent loops. Supercurrent loops arise in multiterminal $φ_0$-junction arrays as a consequence of next-nearest neighbor Josephson coupling. Tuning the density of vortices to commensurate values of the frustration parameter results in an enhancement of the ratchet effect. In addition, we find a surprising sign reversal of the ratchet effect near frustration 1/3. Our work calls for the search for novel magnetic structures in artificial crystals in the absence of time-reversal symmetry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_13819 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spontaneous supercurrents and vortex depinning in two-dimensional arrays of $φ_0$-junctions Reinhardt, Simon Penner, Alexander-Georg Berger, Johanna Baumgartner, Christian Gronin, Sergei Gardner, Geoffrey C. Lindemann, Tyler Manfra, Michael J. Glazman, Leonid I. von Oppen, Felix Paradiso, Nicola Strunk, Christoph Superconductivity Two-dimensional arrays of ballistic Josephson junctions are important as model systems for synthetic quantum materials. Here, we investigate arrays of multiterminal junctions which exhibit a phase difference $φ_0$ at zero current. When applying an in-plane magnetic field we observe nonreciprocal vortex depinning currents. We explain this effect in terms of a ratchet-like pinning potential, which is induced by spontaneous supercurrent loops. Supercurrent loops arise in multiterminal $φ_0$-junction arrays as a consequence of next-nearest neighbor Josephson coupling. Tuning the density of vortices to commensurate values of the frustration parameter results in an enhancement of the ratchet effect. In addition, we find a surprising sign reversal of the ratchet effect near frustration 1/3. Our work calls for the search for novel magnetic structures in artificial crystals in the absence of time-reversal symmetry. |
| title | Spontaneous supercurrents and vortex depinning in two-dimensional arrays of $φ_0$-junctions |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2406.13819 |