Concurrence of anomalous Hall effect and charge density wave in a superconducting topological kagome metal

As one of the most fundamental physical phenomena, the anomalous Hall effect (AHE) typically occurs in ferromagnetic materials but is not expected in conventional superconductors. Here, the authors find a giant AHE in the kagome superconductor CsV₃Sb₅. Strikingly, the AHE develops spontaneously with the occurrence of a charge density wave (CDW), indicating a strong correlation between the CDW state and AHE. These discoveries make CsV₃Sb₅ an ideal platform to study the interplay among nontrivial band topology, CDW, and unconventional superconductivity