Spin dynamics of an Ising chain with bond impurity in a tilt magnetic field

Xiao-Juan Yuan, Jing-Fen Zhao, Hui Wang, Hong-Xia Bu, Hui-Min Yuan, Bang-Yu Zhao and Xiang-Mu Kong

Physica A: Statistical Mechanics and its Applications, 2021, vol. 583, issue C

Abstract: 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 (Bxi≠0), the weak- and strong-bond impurity effect on the dynamics of the transverse Ising model without LMF (the impurity strength Jj≠Ji, Bxi=0), and their combining effect (Jj≠Ji, Bxi≠0), 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.

Keywords: Bond impurity; Longitudinal magnetic field; Spectral density (search for similar items in EconPapers)
Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:583:y:2021:i:c:s0378437121005525

DOI: 10.1016/j.physa.2021.126279

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