Guo X., Li Y., and Jia C.L.

Weillustrate analytically the formation of vector-spin-chirality bound state due to spin?phonon interaction conditioned by the inverse Dzyaloshinskii?Moriya mechanism. The non-equilibrium dynamics of spin-chirality is effectively mapped into the spin-boson model. For spin-1/2 systems, our study suggests an existence of a gapless first-order phase transition from incoherent to coherent spin fluctuations, which is quantified to an emergence of spin-chirality bound state. The critical strength of spin?phonon interaction is found to be determined by the ratio between the amplitude of spin fluctuations and the Debye frequency of system.

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