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Recent experiments on geometrically frustrated kagome metal AV3Sb5 (A=K, Rb,Cs) have revealed the emergence of the charge loop current (cLC) order near thebond order (BO) phase. However, the origin of the cLC and its relation to otherphases have been uncovered. Here, we discover a novel mechanism of the cLCstate, by focusing on the BO phase common in kagome metals. The BO fluctuationsin metals mediate the odd-parity particle-hole condensation, which drives thetopological charge-current. This state is further stabilized by the finiteelectron-phonon coupling and the off-site Coulomb interaction. Furthermore, itis worth noting that the predicted cLC+BO phase gives rise to the Z3-nematicstate in addition to the giant anomalous Hall effect. The present theorypredicts the close relationship between the cLC, the BO, and the nematicity,which is significant to understand the cascade of quantum electron states inkagome metals.

Charge-loop current order and Z3 nematicity mediated by bond-order fluctuations in kagome metal AV3Sb5 (A=Cs,Rb,K)