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arXiv 2103.13274cond-mat.str-el
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Kitaev-Heisenberg-Gamma模型的变分研究

Variational study of the Kitaev-Heisenberg-Gamma model

Shang-Shun Zhang, Gábor B. Halász, Wei Zhu, Cristian D. Batista

摘要:

基于Kitaev蜂窝模型的精确分数阶激发,采用变分方法计算了Kitaev-Heisenberg-Gamma模型的低能激发谱和动力学自旋结构因子.这种新的方法揭示了Kitaev自旋液相在铁磁和反铁磁Kitaev极限附近不对称稳定的物理原因。此外,我们证明了分数激发形式的束缚态在特定区域的每个Kitaev自旋液相和某些相变诱导海森堡和伽马相互作用是由这样的束缚态的凝聚。值得注意的是,这种束缚态出现作为一个尖锐的模式中的动态自旋结构因子,而其在适当的相变的冷凝模式提供了一个简单的解释磁有序相周围的每个Kitaev自旋液相。

英文摘要:

We compute the low-energy excitation spectrum and the dynamical spin structure factor of the Kitaev-Heisenberg-Gamma model through a variational approach based on the exact fractionalized excitations of the pure Kitaev honeycomb model. This novel approach reveals the physical reason for the asymmetric stability of the Kitaev spin liquid phases around the ferromagnetic and antiferromagnetic Kitaev limits. Moreover, we demonstrate that the fractionalized excitations form bound states in specific regions of each Kitaev spin liquid phase and that certain phase transitions induced by Heisenberg and Gamma interactions are driven by the condensation of such a bound state. Remarkably, this bound state appears as a sharp mode in the dynamical spin structure factor, while its condensation patterns at the appropriate phase transitions provide a simple explanation for the magnetically ordered phases surrounding each Kitaev spin liquid phase.

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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