Dresden 2026 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 50: German-French Focus Session: Superconducting Junctions and Quantum Circuits

TT 50.5: Topical Talk

Wednesday, March 11, 2026, 17:15–17:45, HSZ/0003

Proximity superconductivity in chiral Kagome antiferromagnets — •Piet Brouwer, Adam Chaou, Gal Lemut, and Felix von Oppen — Freie Universität Berlin, Dahlem Center for Complex Quantum Systems, Fachbereich Physik, and Halle-Berlin- Regensburg Cluster of Excellence CCE, Arnimallee 14, 14195 Berlin

Recent experiments on the chiral Kagome antiferromagnet Mn₃Ge have provided strong evidence of proximity-induced spin-polarized superconductivity. We introduce and explore a minimal model which exhibits a rich phase diagram as a function of chemical potential and spin canting. We find a valley-singlet superconducting phase for chemical potentials and canting consistent with the experimental system. This phase transitions into a Chern insulator at larger canting and gives way to topological superconducting phases with Chern numbers C_BdG = ± 1, ± 3 at other chemical potentials. Our results show that proximity-induced superconductivity in Kagome antiferromagnets is a promising route towards superconductivity with spin-polarized Cooper pairs.

Keywords: superconductor proximity effect; noncollinear antiferromagnets; Josephson effect