Field-free Josephson diode and tunable ϕ 0 -junction in chiral kagome antiferromagnets (opens in new tab)

The recent realization of superconducting proximity effects in chiral antiferromagnets (cAFMs) opens a new route to nonreciprocal superconducting transport of fundamental interest and practical importance. Using microscopic modeling and symmetry analysis, we show that Josephson junctions formed by conventional s-wave superconductors (SCs) and cAFMs on the kagome lattice exhibit both Josephson diode effects and anomalous Josephson effects (a ϕ0-junction state with a finite supercurrent at zero...