arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1606.01099cond-mat.dis-nncond-mat.stat-mechquant-ph
收藏

淬火和退火无序共同存在下量子$XY$自旋模型的自发磁化

Spontaneous magnetization of quantum $XY$ spin model in joint presence of quenched and annealed disorder

Anindita Bera, Debraj Rakshit, Aditi Sen De, Ujjwal Sen

摘要:

研究了在外加磁场中,当相互作用和场部分受到猝灭和退火无序时,量子XY自旋1/2模型的平衡统计性质.系统中存在的随机性被称为退火或淬火,这取决于两个不同时间尺度之间的关系-与随机性的平衡和观察时间相关的时间尺度。在平均场的框架内,我们研究了自发磁化的障碍的影响,无论是微扰和数值技术。我们的主要兴趣是了解淬火和退火的情况下之间的差异,也调查的相互作用时,他们都存在于一个系统中。我们特别观察到,当相互作用和场项分别淬火和退火,临界温度的系统磁化方向平行于所施加的磁场不依赖于任何的障碍。此外,退火无序相互作用既不影响磁化强度,也不影响临界温度。我们对相互作用术语和场术语中的各种失调组合进行了比较研究,并指出了它们的共性特征。

英文摘要:

We investigate equilibrium statistical properties of the quantum XY spin-1/2 model in an external magnetic field when the interaction and field parts are subjected to quenched or/and annealed disorder. The randomness present in the system are termed annealed or quenched depending on the relation between two different time scales - the time scale associated with the equilibriation of the randomness and the time of observation. Within a mean-field framework, we study the effects of disorders on spontaneous magnetization, both by perturbative and numerical techniques. Our primary interest is to understand the differences between quenched and annealed cases, and also to investigate the interplay when both of them are present in a system. We observe in particular that when interaction and field terms are respectively quenched and annealed, critical temperature for the system to magnetize in the direction parallel to the applied field does not depend on any of the disorders. Further, an annealed disordered interaction neither affects the magnetizations nor the critical temperatures. We carry out a comparative study of the different combinations of the disorders in the interaction and field terms, and point out their generic features.

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。

↑