Vector-spin-chirality bound state driven by the inverse Dzyaloshinskii–Moriya mechanism

Abstract

We illustrate 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.

Keywords

• phase transition
• spin–phonon interaction
• vector-spin-chirality
• bound state