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New physics can emerge in magnetic materials where quantum fluctuations areenhanced due to reduced dimensionality and strong frustration. One long soughtexample is the resonating-valence-bond (RVB) state, where atomic magneticmoments are strongly correlated but do not order or freeze even in the limit ofT -> 0. The RVB ground state does not break conventional symmetries, such aslattice translation or spin-rotation. The realization of such a quantum spinliquid in two-dimensions would represent a new state of matter. It is believedthat spin liquid physics plays a role in the phenomenon of high-Tcsuperconductivity, and the topological properties of the spin liquid state mayhave applications in the field of quantum information. We present neutronscattering measurements of the spin excitations on single crystal samples ofthe spin-1/2 kagom\'{e} lattice antiferromagnet ZnCu3(OD)6Cl2 (also calledherbertsmithite). Our observation of a spinon continuum in a two-dimensionalmagnet is remarkable first. The results serve as a key fingerprint of thequantum spin liquid state in herbertsmithite.

Fractionalized excitations in the spin liquid state of a kagom\'{e} lattice antiferromagnet