Field theory analysis of S=1 antiferromagnetic bond-alternating chains in the dimer phase
Field theory analysis of S=1 antiferromagnetic bond-alternating chains in the dimer phase
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二聚体相中S=1反铁磁键交替链的场论分析
DOI：
10.1103/physrevb.85.134431
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
J. Tamaki and M. Oshikawa
中科院分区：
文献类型：
--
作者：
K. Oyoshi;S. Nigo;J. Inoue;O. Sakai;H. Kitazawa and G. Kido;S.Hikami;Hiroya Nakao;上田光一;J. Tamaki and M. Oshikawa
本文用场论方法研究了二聚体相反铁磁交替键链在与铁磁相临界点附近的动力学。该模型被认为代表化合物Ni（CHN）（NO）ClO（缩写为NTENP）。我们从临界点的Tomonaga-Luttinger液体开始，推导出sine-Gordon（SG）场论作为该系统的低能有效模型。利用SG理论的精确解，我们给出了NTENP低能激发谱的场论图象。所得结果与NTENP中子非弹性散射实验结果和动力学结构因子的数值计算结果符合得很好。此外，在所获得的理论图片的基础上，我们预测，对应于一个单一的元激发的尖锐的峰不存在于NTENP的拉曼散射谱的非弹性中子散射谱。
Dynamics ofantiferromagnetic bond-alternating chains in the dimer phase, in the vicinity of the critical point with the Haldane phase, is studied by a field theoretical method. This model is considered to represent the compound Ni(CHN)(NO)ClO(abbreviated as NTENP). We derive a sine-Gordon (SG) field theory as a low-energy effective model of this system, starting from a Tomonaga-Luttinger liquid at the critical point. Using the exact solution of the SG theory, we give a field theoretical picture of the low-energy excitation spectrum of NTENP. Results derived from our picture are in a good agreement with results of inelastic neutron scattering experiments on NTENP and numerical calculation of the dynamical structure factor. Furthermore, on the basis of the obtained theoretical picture, we predict that the sharp peaks corresponding to a single elementary excitation are absent in the Raman scattering spectrum of NTENP in contrast to the inelastic neutron scattering spectrum.