Abstract
Spin glass has been studied quite extensively for years as a typical model system of complex systems Yet, Its true nature Is not fully understood. In this article, the "chirality hypothesis" of the spin glass ordering is reviewed, with particular emphasis on the recent experimental and theoretical development. The topic includes the the nature of the replica-symmetry breaking of the spinglass state, the off-equilibrium fluctuation-dissipation ratio of the Heisenberg spin glass, and the anomalous Hall effect of canonical spin glass as a probe of the chiral order.
