Chiral kagome superconductivity modulations with residual Fermi arcs

In a recent publication, a collaboration led by Jia-Xin Yin of SUST and including the group of T. Neupert at UZH, report the detection of chiral superconducting gap modulations with residual Fermi arcs in KV₃Sb₅ and CsV₃Sb₅ kagome materials using scanning tunneling experiments at ultra-low temperatures. The authors find a U-shaped superconducting gap with chiral 2a × 2a spatial modulations. Furthermore, quasiparticle interference measurements uncovered segmented Fermi arcs within the superconducting state. These findings suggest that the superconducting order has a chiral pair-density-wave component, offering insights into the interplay of superconductivity and charge-density-wave order in these materials. The results are published in Nature 632, pages 775–781 (2024).