Spin-Peierls transition in an anisotropic two-dimensional XY model

Article

关键词: MEAN-FIELD THEORY;    HEISENBERG-MODEL;    PHASE-TRANSITION;    GROUND-STATE;    NEEL STATE;    DIAGRAM;    SCATTERING;    CUGEO3;    CHAIN;   

DOI  :  10.1103/PhysRevB.64.012414

来源: SCIE

【 摘 要 】

The two-dimensional Jordan-Wigner transformation is used to investigate the zero-temperature spin-Peierls transition for an anisotropic two-dimensional XY model in the adiabatic limit. The phase diagram between the dimerized (D) state and uniform (U) state is shown in the parameter space of dimensionless interchain coupling h (=J(perpendicular to)/J) and spin-lattice coupling eta. It is found that the spin-lattice coupling eta must exceed some critical value eta (c) in order to reach the D phase for any finite h. The dependence of eta (c), on It is given by - 1/ln h for h --> \0 and the transition between the U and D phases is of first order for at least h>10(-3).

【 授权许可】

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