论文标题
亚稳定的基塔夫磁铁
Metastable Kitaev Magnets
论文作者
论文摘要
大约二十年前，Alexei Kitaev提出了一个模型，该模型在二维蜂窝状晶状体上具有键合粒子的自旋$ 1/2 $颗粒，该模型有可能容纳量子自旋基态。这项工作启动了许多研究和合成可以实际意识到Kitaev Hamiltonian的材料的研究。 The first-generation of such materials, such as Na$_{2}$IrO$_{3}$, $α$-Li$_{2}$IrO$_{3}$, and $α$-RuCl$_{3}$, revealed the presence of non-Kitaev interactions such as the Heisenberg and off-diagonal exchange.物理压力和化学掺杂都被用来调整Kitaev的相对强度和竞争相互作用。但是，在实现纯粹的基塔夫系统方面取得了很少的进展。在这里，我们回顾了最近通过导致Kitaev材料的第二代修饰Kitaev磁铁修改Kitaev磁铁的突破。我们展示了由于拓扑交换反应引起的结构修饰如何改变磁相互作用，而有利于量子自旋阶段。
Nearly two decades ago, Alexei Kitaev proposed a model for spin-$1/2$ particles with bond-directional interactions on a two-dimensional honeycomb lattice which had the potential to host a quantum spin-liquid ground state. This work initiated numerous investigations to design and synthesize materials that would physically realize the Kitaev Hamiltonian. The first-generation of such materials, such as Na$_{2}$IrO$_{3}$, $α$-Li$_{2}$IrO$_{3}$, and $α$-RuCl$_{3}$, revealed the presence of non-Kitaev interactions such as the Heisenberg and off-diagonal exchange. Both physical pressure and chemical doping were used to tune the relative strength of the Kitaev and competing interactions; however, little progress was made towards achieving a purely Kitaev system. Here, we review the recent breakthrough in modifying Kitaev magnets via topochemical methods that has led to the second-generation of Kitaev materials. We show how structural modifications due to the topotactic exchange reactions can alter the magnetic interactions in favor of a quantum spin-liquid phase.
