arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1010.4348cond-mat.stat-mech
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随机场对一维量子XXZ模型动力学的影响

Effects of random fields on the dynamics of the one-dimensional quantum XXZ model

Yin-Yang Shen, Xiao-Juan Yuan, Xiang-Mu Kong

摘要:

利用递推关系方法研究了具有随机场的一维自旋1/2量子XXZ模型的动力学性质。当场满足双峰分布时,当各向异性参数Δ较小时,随着场的增加,系统表现出集体模行为和中心峰行为之间的交叉;随着Δ的增加,无序行为取代了交叉。对于高斯分布和双高斯分布,当标准差较小时,结果与双峰分布相似;当标准差足够大时,系统只表现出无序行为,与Δ无关。

英文摘要:

The dynamics of the one-dimensional spin-1/2 quantum XXZ model with random fields is investigated by the recurrence relations method. When the fields satisfy the bimodal distribution, the system shows a crossover between a collective-mode behavior and a central-peak one with increasing field while the anisotropy parameter Δ is small; a disordered behavior replaces the crossover as Δ increases. For the cases of Gaussian and double-Gaussian distributions, when the standard deviation is small, the results are similar to that of the bimodal distribution; while the standard deviation is large enough, the system only shows a disordered behavior regardless of Δ.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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