Critical Properties of S = 1 Bond-Alternating XXZ Chains and Hidden Z2 x Z2 Symmetry
Critical Properties of S = 1 Bond-Alternating XXZ Chains and Hidden Z2 x Z2 Symmetry
复制标题
S = 1 键交替 XXZ 链和隐藏 Z2 x Z2 对称性的关键性质
DOI：
10.1143/jpsj.66.3944
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发表时间：
1997
影响因子：
1.7
通讯作者：
K. Nomura
中科院分区：
文献类型：
--
作者：
A. Kitazawa;K. Nomura
数值研究了自旋1键交替XXZ链的临界性质。该模型适用于研究Half带隙问题的VBS图象和隐藏的Z2 × Z2对称性.可能的相是铁磁相、XY相、Halfenite相、二聚体相和Neel相。该模型的临界性质可以解释为反映隐藏的Z2 × Z2对称性的Ashkin-Teller型.相变是Berezinskiii-Kosterlitz-无相变型（XY-Haldane和XY-dimer）、二维高斯型（Haldane-dimer）和二维伊辛型（Haldane-Neel和dimer-Neel）。我们确定的相边界和普适类使用最近开发的技术由作者。
Critical properties of the spin-1 bond-alternating XXZ chain are studied numerically. This model is appropriate to study the VBS picture and hidden Z 2 × Z 2 symmetry concerning to the Haldane gap problem. The possible phases are the ferromagnetic, the X Y , the Haldane, the dimer, and the Neel ones. The critical properties of this model can be interpreted as the Ashkin-Teller type reflecting the hidden Z 2 × Z 2 symmetry. The phase transitions are of the Berezinskii-Kosterlitz-Thouless type (XY-Haldane and XY-dimer), of the 2D Gaussian type (Haldane-dimer), and of the 2D Ising type (Haldane-Neel and dimer-Neel). We determine the phase boundary and universality class using the recent developed techniques by the authors.