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arXiv 0906.3443cond-mat.str-el
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Ising + Dzyaloshinskiii-Moriya模型中的变磁相变

Metamagnetic phase transition in the Ising plus Dzyaloshinskii-Moriya model

M. R. Soltani, S. Mahdavifar, Alireza Akbari, A. A. Masoudi

摘要:

研究了具有Dzyaloshinskiii-Moriya(DM)相互作用的一维铁磁Ising(自旋为1/2)模型.用Lanczos方法分析了低能激发谱和基态磁相图。计算了低能激发谱、螺旋序参量和自旋-自旋关联函数的DM相互作用依赖性。我们发现在铁磁相和螺旋相之间发生了变磁量子相变。用变分矩阵积态方法证实了变磁相变的存在。

英文摘要:

We study the 1D ferromagnetic Ising (spin-1/2) model with the Dzyaloshinskii-Moriya (DM) interaction. We analyze the low energy excitation spectrum and the ground state magnetic phase diagram using the Lanczos method. The DM interaction-dependency is calculated for the low-energy excitation spectrum, spiral order parameter and spin-spin correlation functions. We show that a metamagnetic quantum phase transition occurs between the ferromagnetic and spiral phases. The existence of the metamagnetic phase transition is confirmed, using the variational matrix product states approach.

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