SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 48: Topological Superconductors
TT 48.5: Vortrag
Donnerstag, 30. März 2023, 10:30–10:45, HSZ 304
Magnetic-domain mediated topological superconductivity in a Josephson Junction — •Ignacio Sardinero1, Rubén Seoane Souto2,3, and Pablo Burset1 — 1Department of Theoretical Condensed Matter Physics, Condensed Matter Physics Center (IFIMAC) and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, 28049 Madrid, Spain — 2Division of Solid State Physics and NanoLund, Lund University, S-221 00 Lund, Sweden — 3Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
Topological superconductors are appealing building blocks for robust and reliable quantum information processing. Most platforms for engineering topological superconductivity rely on a combination of materials with intrinsic spin-orbit coupling and external magnetic fields, which are usually challenging to manipulate. We propose and describe a setup without spin-orbit or magnetic fields where a conventional Josephson junction is linked by a narrow ferromagnetic insulator with multi-domain structure along the interface. Our calculations show that sequences of magnetic domains preserving the net magnetization’s rotation direction are sufficient for generating topological superconductivity in a wide range of parameters and degrees of disorder. We find that the topological phase transition strongly depends on the magnitude and period of the net magnetization. Interestingly, a phase bias across the junction can control and tune the formation and localization of a pair of Majorana zero-energy modes along the junction interface, with an observable effect on the current-phase relation.