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Spin dynamics of an Ising chain with bond impurity in a tilt magnetic field
Physica A: Statistical Mechanics and its Applications ( IF 3.3 ) Pub Date : 2021-07-24 , DOI: 10.1016/j.physa.2021.126279
Xiao-Juan Yuan 1 , Jing-Fen Zhao 1 , Hui Wang 1 , Hong-Xia Bu 1 , Hui-Min Yuan 1 , Bang-Yu Zhao 1 , Xiang-Mu Kong 2
Affiliation  

Spin dynamics of quantum Ising system has been the subject of condensed matter physics in the past few decades. In this work, the bond-impurity effects on dynamics of the one-dimensional quantum Ising model with both transverse (Bzi) and longitudinal magnetic field (LMF, Bxi) was studied in the high-temperature limit by the recurrence relations method. Three cases, i.e., the LMF effect on the dynamics of the pure Ising model without impurity (Bxi0), the weak- and strong-bond impurity effect on the dynamics of the transverse Ising model without LMF (the impurity strength JjJi, Bxi=0), and their combining effect (JjJi, Bxi0), were investigated respectively. It is found that the dynamical behaviors of the system depend on both the impurity and the LMF. In general, the central-peak behavior (collective-mode behavior) will be enhanced (depressed) when increasing Jj or Bxi properly. However, when Jj reaches a critical value Jjc , the spin motion will be frozen, i.e., the bond impurity will act as a switch, which may turn off or turn on the spin motion. In contrast, the LMF can active the motion of the frozen spin. Therefore, the dynamical behavior of the Ising system depends on the combining effects of the impurity and the LMF.



中文翻译:

倾斜磁场中带有键杂质的伊辛链的自旋动力学

量子伊辛系统的自旋动力学在过去的几十年里一直是凝聚态物理学的主题。在这项工作中,键 - 杂质对具有横向(z一世) 和纵向磁场 (LMF, X一世) 在高温极限下通过递推关系法进行研究。三种情况,即LMF对没有杂质的纯Ising模型动力学的影响(X一世0),弱键和强键杂质对没有 LMF 的横向 Ising 模型动力学的影响(杂质强度 JjJ一世, X一世=0),以及它们的组合效果(JjJ一世, X一世0),分别进行了调查。发现系统的动力学行为取决于杂质和 LMF。一般来说,当增加时,中心峰行为(集体模式行为)会增强(降低)Jj 要么 X一世适当地。然而,当Jj 达到临界值 JjC,自旋运动将被冻结,即键杂质将作为一个开关,可以关闭或打开自旋运动。相比之下,LMF 可以激活冻结自旋的运动。因此,Ising 系统的动力学行为取决于杂质和 LMF 的组合效应。

更新日期:2021-07-30
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