Nature Physics, Published online: 15 June 2026; doi:10.1038/s41567-026-03331-2 Time-reversal symmetry breaking in kagome metals remains an open problem. Now, a circulating phase called the loop-current order is shown to break time-reversal symmetry at a temperature well above the charge order transition in CsV3Sb5.
Evidence of time-reversal symmetry breaking above the charge density wave order in a kagome metal
Yeongkwan Kim