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arXiv 2007.07509cond-mat.str-el
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一维广义Kitaev模型的自旋波理论

Spin wave theory of one-dimensional generalized Kitaev model

Wang Yang, Alberto Nocera, Ian Affleck

摘要:

在这项工作中,我们执行的经典和自旋波分析的结合一维自旋$S$ Kitaev-Heisenberg-Gamma模型在反铁磁Kitaev耦合区域。发现了四个相,包括Néel有序相、具有$O_h\rightarrow D_3$对称性破缺的相和“$D_3$ -破缺I、II”相,它们都以不同的方式破缺$D_3$对称性,其中$O_h$是完整的八面体群,而$D_3$是六阶的二面体群。在SU(2)对称铁磁隐点附近微扰计算了最低自旋波质量。

英文摘要:

In this work, we perform a combination of classical and spin wave analysis on the one-dimensional spin-$S$ Kitaev-Heisenberg-Gamma model in the region of an antiferromagnetic Kitaev coupling. Four phases are found, including a Néel ordered phase, a phase with $O_h\rightarrow D_3$ symmetry breaking, and "$D_3$-breaking I, II" phases which both break $D_3$ symmetries albeit in different ways, where $O_h$ is the full octahedral group and $D_3$ is the dihedral group of order six. The lowest-lying spin wave mass is calculated perturbatively in the vicinity of the hidden SU(2) symmetric ferromagnetic point.

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