Reinhardt, S. and Penner, A. G. and Berger, J. and Baumgartner, C. and Gronin, S. and Gardner, G. C. and Lindemann, T. and Manfra, M. J. and Glazman, L. I. and Von Oppen, F. and Paradiso, Nicola and Strunk, Christoph (2025) Spontaneous supercurrents and vortex depinning in two-dimensional arrays of φ 0 Josephson junctions. PHYSICAL REVIEW B, 112 (22): 224503. ISSN 2469-9950, 2469-9969
Full text not available from this repository. (Request a copy)Abstract
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 q 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 ratchetlike pinning potential, which is induced by spontaneous supercurrent loops. Supercurrent loops arise in multiterminal q 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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | QUANTUM PHASE-TRANSITIONS; RESISTIVE TRANSITION; VORTICES; EMISSION; DYNAMICS |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Christoph Strunk |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Jul 2026 09:04 |
| Last Modified: | 15 Jul 2026 09:04 |
| URI: | https://pred.uni-regensburg.de/id/eprint/66959 |
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