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Quantum spin liquid (QSL) represents a new class of condensed matter statescharacterized by the long-range many-body entanglement of topological orders.The most prominent feature of the elusive QSL state is the existence offractionalized spin excitations. Subject to the strong quantum fluctuations,the spin-1/2 antiferromagnetic system on a kagome lattice is the promisingcandidate for hosting a QSL ground state, but the structurally idealrealization is rare. Here, we report Raman scattering on the single crystallineCu$_3$Zn(OH)$_6$FBr, and confirm that the ideal kagome structure remains downto low temperatures without any lattice distortion by the angle-resolvedpolarized Raman responses and second-harmonic-generation measurements.Furthermore, at low temperatures the Raman scattering reveals a continuum ofthe spin excitations in Cu$_3$Zn(OH)$_6$FBr, in contrast to the sharp magnonpeak in the ordered kagome antiferromagnet EuCu$_3$(OH)$_6$Cl$_3$. Suchmagnetic Raman continuum, in particular, the substantial low-energy one-pairspinon excitation serves as strong evidence for fractionalized spin excitationsin Cu$_3$Zn(OH)$_6$FBr.

Dynamic fingerprint of fractionalized excitations in single-crystalline Cu$_3$Zn(OH)$_6$FBr