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arXiv 1101.0217cond-mat.str-el
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锯齿形自旋链系统中的螺旋自旋态

The spiral spin state in a zigzag spin chain system

Meihua Chen, Chong Der Hu

摘要:

我们考虑了具有最近邻和次最近邻交换作用、各向异性交换作用和Dzyaloshinskiii-Moriya相互作用的自旋链。分析了螺旋自旋态作为基态的条件。我们的方法是用幺正变换建立螺旋态和全极化态之间的联系。在这种变换下,各向异性交换相互作用和Dzyaloshinskiii-Moriya相互作用可以相互转换。然后利用半正定矩阵定理,确定了全极化态区域作为变换后哈密顿量的基态,而螺旋自旋态区域作为原哈密顿量的基态。我们还发现Dzyaloshinskiii-Moriya相互作用的影响是重要的。它的强度与螺旋自旋的螺距角有关。我们的方法可以应用到耦合自旋链和二维三角晶格系统。计算结果可与实验数据进行比较。

英文摘要:

We considered a spin chain with nearest neighbor and next nearest neighbor exchange interactions, anisotropic exchange interaction and Dzyaloshinskii-Moriya interaction. The conditions of the spiral spin state as the ground state were analyzed. Our method was to build the connection between the spiral state and the fully polarized state with a unitary transformation. Under this transformation, anisotropic exchange interaction and Dzyaloshinskii-Moriya interaction can be transformed to each other. Then we used positive semi-definite matrix theorem to identify the region of fully polarized state as the ground state for the transformed Hamiltonian, and it is the region of spiral spin state as the ground state of the original Hamiltonian. We also found that the effect of Dzyaloshinskii-Moriya interaction is important. Its strength is related to the pitch angle of spiral spins. Our method can be applied to coupled spin chains and two dimensional triangular lattice systems. The result can be compared with experiment data.

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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