Spontaneous supercurrents and vortex depinning in two-dimensional arrays of φ0 Josephson junctions
S. Reinhardt, A. G. Penner, J. Berger, C. Baumgartner, S. Gronin, G. C. Gardner, T. Lindemann, M. J. Manfra, L. I. Glazman, F. von Oppen, N. Paradiso, C. Strunk
DOI 10.1103/31zv-84hw · Physical Review B
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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 φ0 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 φ0 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.45 | Pressure not reported | onset |
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