arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1210.7693cond-mat.str-elmath-phmath.MP
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自旋为1/2XXZ的Dzyaloshinskiii-Moriya链中磁电效应的精确描述

Exact description of the magnetoelectric effect in the spin-1/2 XXZ-chain with Dzyaloshinskii-Moriya interaction

Michael Brockmann, Andreas Klümper, Vadim Ohanyan

摘要:

本文考虑一个简单的具有磁电效应的自旋链可积模型。从周期性的S=1/2的带有Dzyaloshinskiii-Moriya项的XXZ-链出发,我们将其看作是Katsura-Nagaosa-Baladsky(KNB)机制中的局部电极化的强度,并将其映射到具有扭曲边界条件的常规XXZ-链上.利用量子转移矩阵(QTM)和非线性积分方程(NLIE)技术,我们得到了任意温度下磁化强度、电极化的强度和磁电张量随磁场和电场的变化关系。我们调查这些依赖关系,以及上述物理量的热行为,特别是在低温制度。我们发现了几种极化机制。调节磁场可以将系统从一种状态切换到另一种状态。文中还说明了与此相关的临界性质的特征。

英文摘要:

We consider a simple integrable model of a spin chain exhibiting the Magnetoelectric Effect (MEE). Starting from the periodic S=1/2 XXZ-chain with Dzyaloshinskii-Moriya terms, which we consider as a local electric polarization in the spirit of the Katsura-Nagaosa-Baladsky (KNB) mechanism, we perform the mapping onto the conventional XXZ-chain with twisted boundary conditions. Using the techniques of Quantum Transfer Matrix (QTM) and Non-Linear Integral Equations (NLIE) we obtain the magnetization, electric polarization and magnetoelectric tensor as functions of magnetic and electric field for arbitrary temperatures. We investigate these dependencies as well as the thermal behavior of the above mentioned physical quantities, especially in the low-temperature regime. We found several regimes of polarization. Adjusting the magnetic field one can switch the system from one regime to another. The features of the critical properties connected with the MEE are also illustrated.

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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