Theoretical study of vector-spin-chirality bound state driven by the inverse Dzyaloshinskii-Moriya mechanism in the one-dimensional antiferromagnetic chain
There is a strong quantum fluctuation effect in the low-dimensional magnetic materials,and multiple interaction mechanisms can be induced by structural asymmetry or external field perturbation.Whereas the sys-tem possesses types of hidden multiple-spin ordering,such as spin-nematic state or spin-chirality state etc.Therefore,low-dimensional magnetic materials show a series of novel physical properties.The vector-spin-chirality bound state driven by the inverse Dzyaloshinskii-Moriya mechanism can be coupled with phonons and has richer physical phenomena.A one-dimensional antiferromagnetic chain with spin chirality-phonons cou-pling model is studied in the conditions of sub-Ohmic(0＜s＜1),Ohmic(s=1)and super-Ohmic(s＞1),respectively.We investigate in detail the time evolution of the spin chirality under different strengths of spin-phonon coupling but with same initial state.Our analytical study reveals that the system undergoes a gapless first-order phase transition by increasing the spin chirality-phonon interaction.The incoherent spin fluctuations can be strongly suppressed due to the formation of spin-chirality bound state driven by the spin-phonon cou-pling of Dzyaloshinskii-Moriya type.The ratio between the spin fluctuations and the Debye frequency of pho-nons determines the critical point of spin-phonon interaction in a fixed s,beyond which the gapped spin-chiral state is resulted in.Our research will provide theoretical guidance for obtaining long-term spin coherent systems in the applications of quantum transport and quantum storage.
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