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TT: Fachverband Tiefe Temperaturen
TT 6: Superconductivity: Tunnelling and Josephson Junctions I
TT 6.3: Vortrag
Montag, 18. März 2024, 10:00–10:15, H 3010
Magnetochiral vortex rachet effect in two-dimensional semiconductor-superconductor Josephson junction arrays — •Simon Reinhardt1, Johanna Berger1, Sergei Gronin2, Geoffrey C. Gardner2, Tyler Lindemann2, Michael J. Manfra2, Nicola Paradiso1, and Christoph Strunk1 — 1Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany — 2Purdue University, West Lafayette, Indiana 47907, USA
We study two-dimensional Josephson junction arrays in hybrid aluminum/InGaAs/InAs semiconductor-superconductor heterostructures. An out-of-plane magnetic field induces vortices, which form ordered patterns for commensurate values of the frustration parameter. We probe the symmetry of the intrinsic vortex pinning potential using critical current measurements. When applying in-plane magnetic fields we observe non-reciprocal vortex depinning currents, revealing a ratchet-like vortex pinning potential. We discuss how this novel effect can be linked to the anomalous Josephson effect, caused by the combination of Rashba spin-orbit coupling and Zeeman field [1,2,3].
[1] W. Mayer et al., Nat. Commun. 11 (2020) 212
[2] C. Baumgartner et al., Nat. Nanotechnol. 17 (2021) 39
[3] S. Reinhardt et al., arXiv:2308.01061 (2023)