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We report a new kagome quantum spin liquid candidate Cu$_3$Zn(OH)$_6$FBr,which does not experience any phase transition down to 50 mK, more than threeorders lower than the antiferromagnetic Curie-Weiss temperature ($\sim$ 200 K).A clear gap opening at low temperature is observed in the uniform spinsusceptibility obtained from $^{19}$F nuclear magnetic resonance measurements.We observe the characteristic magnetic field dependence of the gap as expectedfor fractionalized spin-1/2 spinon excitations. Our experimental resultsprovide firm evidence for spin fractionalization in a topologically orderedspin system, resembling charge fractionalization in the fractional quantum Hallstate.

Gapped spin-1/2 spinon excitations in a new kagome quantum spin liquid compound Cu$_3$Zn(OH)$_6$FBr