Commensurate and incommensurate correlations in Haldane-gap antiferromagnets

Article

关键词: QUANTUM SPIN CHAINS;    MATRIX RENORMALIZATION-GROUP;    ISOTROPIC HEISENBERG CHAIN;    ARBITRARY SPINS;    DISORDER POINTS;    MAGNETIC-FIELD;    PHASE;    EXCITATIONS;    MODEL;    TRANSITION;   

DOI  :  10.1103/PhysRevB.62.3778

来源: SCIE

【 摘 要 】

We analyze the onset of incommensurabilities around the VBS point of the S = 1 bilinear-biquadratic model. We propose a simple effective field theory which is capable of reproducing all known properties of the commensurate-incommensurate transition at the disorder point theta(VBS) Moreover, the theory predicts another special point theta(disp), distinct from the VBS point, where the Haldane gap behaves singularly. The ground state energy density is an analytic function of the model parameters everywhere, thus we do not have phase transitions in the conventional sense.

【 授权许可】

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