2017 Volume 72 Issue 7 Pages 492-502
Experimental quest for the hypothetical “quantum spin liquid” state has recently met several promising candidate materials. We argue that many of these quantum spin liquids, including triangular-lattice organic salts and kagome-lattice herbertsmithite, might be the randomness-induced ones, either of extrinsic origin due to the impurities and defects, or of intrinsic origin spontaneously generated via the coupling between the spin and other degrees of freedom such as the charge. Recent numerical results on the random s=1/2 Heisenberg model on the triangular and kagome-lattices are reviewed. Implications to recent experiments are discussed.