arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1902.07451cond-mat.str-el
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类Kitaev蜂窝磁体:全局相行为和涌现有效模型

Kitaev-like honeycomb magnets: Global phase behavior and emergent effective models

Juraj Rusnačko, Dorota Gotfryd, Jiří Chaloupka

摘要:

具有强自旋-轨道耦合的过渡金属离子化合物由于可能存在键阻相关的各向异性磁相互作用而引起人们的关注。一般来说,这种相互作用会导致复杂的相图,其中可能包括外来相,例如Kitaev自旋液体。在这里,我们报告我们的全面分析的全球相图的扩展Kitaev海森堡模型相关的蜂窝晶格化合物Na 2 IrO 3和α-RuCl 3。我们利用最近发展起来的自旋相干态的基础上,使我们能够解决任意自旋模式的集团基态通过精确对角化。相图中的全局趋势与哈密顿量的解析映射结合起来理解,这些解析映射揭示了与已知模型的特殊联系--海森堡、伊辛、基塔耶夫或蜂窝晶格上的罗盘模型--或者揭示了精确的无涨落基态的整个流形。最后,我们的研究可以作为一个方法的例子,可以应用到其他自旋模型与复杂的键依赖非海森堡相互作用。

英文摘要:

Compounds of transition metal ions with strong spin-orbit coupling recently attracted attention due to the possibility to host frustrated bond-dependent anisotropic magnetic interactions. In general, such interactions lead to complex phase diagrams that may include exotic phases, e.g. the Kitaev spin liquid. Here we report on our comprehensive analysis of the global phase diagram of the extended Kitaev-Heisenberg model relevant to honeycomb lattice compounds Na2IrO3 and alpha-RuCl3. We have utilized recently developed method based on spin coherent states that enabled us to resolve arbitrary spin patterns in the cluster ground states obtained by exact diagonalization. Global trends in the phase diagram are understood in combination with the analytical mappings of the Hamiltonian that uncover peculiar links to known models - Heisenberg, Ising, Kitaev, or compass models on the honeycomb lattice - or reveal entire manifolds of exact fluctuation-free ground states. Finally, our study can serve as a methodological example that can be applied to other spin models with complex bond-dependent non-Heisenberg interactions.

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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