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arXiv 2408.07968cond-mat.str-el
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自旋-1/2 Kitaev-Heisenberg链中的左-左-右-右磁序

Left-left-right-right magnetic order in spin-1/2 Kitaev-Heisenberg chain

Wang Yang, Chao Xu, Shicheng Ma, Alberto Nocera, Ian Affleck

AI总结:

本文通过解析与数值方法研究自旋-1/2 Kitaev-Heisenberg链在负Kitaev和正Heisenberg耦合区的相图,发现左-左-右-右磁序和无能隙相,澄清其起源并推广到二维条纹序。

摘要:

在这项工作中,我们对自旋-1/2 Kitaev-Heisenberg链在负Kitaev耦合和正Heisenberg耦合区域中的相图进行了分析研究与数值研究相结合的工作。除了反铁磁相之外,我们发现了一个具有左-左-右-右序的磁有序相和一个中心荷值为$c=1$的无能隙相,从而解决了文献中关于该参数区域存在的相互矛盾的结果。特别是,基于微扰Luttinger液体分析,左-左-右-右序的起源得到了澄清。进一步表明,当引入小的非零Gamma相互作用时,左-左-右-右相在Kitaev-Heisenberg-Gamma模型中仍然存在。利用耦合链方法,我们还证明了一维左-左-右-右序为同一模型在蜂窝晶格上的二维条纹序提供了准一维解释。

英文摘要:

In this work, we perform a combination of analytical and numerical studies on the phase diagram of the spin-1/2 Kitaev-Heisenberg chain in the region of negative Kitaev and positive Heisenberg couplings. Apart from the antiferromagnetic phase, we find a magnetically ordered phase with left-left-right-right order and a gapless phase with central charge value $c=1$, resolving the existing contradictory results in literature regarding this parameter region. In particular, the origin of the left-left-right-right order is clarified based on a perturbative Luttinger liquid analysis. The left-left-right-right phase is further shown to persist in the Kitaev-Heisenberg-Gamma model when a small nonzero Gamma interaction is introduced. Using a coupled-chain method, we also demonstrate that the one-dimensional (1D) left-left-right-right order gives a quasi-1D explanation for the 2D stripy order of the same model on the honeycomb lattice.

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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