Quantum liquid in antiferromagnetic chains: A stochastic geometric approach to the Haldane gap.
Quantum liquid in antiferromagnetic chains: A stochastic geometric approach to the Haldane gap.
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DOI：
10.1103/physrevlett.66.798
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发表时间：
1991-02
影响因子：
8.6
通讯作者：
H. Tasaki
中科院分区：
文献类型：
--
作者：
H. Tasaki
研究了S=1量子反铁磁链。通过发展一个（路径积分型）随机几何表示，并利用渗流的思想，我们发现，具有独特的无序基态和间隙的Halcite相可以被视为“液体”。大D相和Neel有序相分别被识别为“气体”和“固体”。我们引入了一个新的序参量，用来区分Halfenz相和其他无序相，如大尺寸相或二聚体相
The S=1 quantum antiferromagnetic chain is studied. By developing a (path-integral-type) stochastic geometric representation and using the ideas of percolation, we find that the Haldane phase with a unique disordered ground state and a gap can be regarded as «liquid». The large-D phase and the Neel ordered phase are identified as «gas» and «solid», respectively. We introduce a new order parameter that distinguishes the Haldane phase from other disordered phases such as the large-D phase or the dimer phase