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We study extremely nonequilibrium transport in correlated kagome magnetMn$_3$Sn by time-resolved terahertz Faraday rotation spectroscopy. When thephotoinjected carrier density exceeds $\sim$10$^{20}$ cm$^{-3}$, a cyclotronresonance is clearly observed, signifying the emergence of unusual carrierswith 2000-times higher mobility than those in equilibrium. The result can beattributed to a drastic change in the band structure owing to screening of theelectron correlation, highlighting the significant role of many-body effects inthis kagome compound in equilibrium. Our study opens up a new phase oftransport properties in correlated kagome materials under highly nonequilibriumconditions.

Emergence of 2000-times higher-mobility carriers through photocarrier screening in correlated kagome magnet Mn$_3$Sn