论文标题
Kitaev旋转液体候选者$α$ -RUCL $ _3 $的一阶拓扑相变的证据
Evidence for the first-order topological phase transition in a Kitaev spin liquid candidate $α$-RuCl$ _3$
论文作者
论文摘要
二维蜂窝晶格上的Kitaev量子自旋液体（QSL）体现了纠缠的拓扑状态，在该状态下，旋转将其分为Majoraga fermions。这个国家引起了极大的兴趣，因为它拥有非亚伯利亚人的兴奋。在$α$ -rucl $ _3 $中观察到的半耗时量化热厅（HIQTH）电导是这些激发的关键签名。但是，这种在强烈领域的拓扑非平凡状态的命运在很大程度上仍然难以捉摸。在这里，我们报告了导热率$κ$和特定的热量$ c $ $α$ -rucl $ _3 $，其平面磁场$ h $。对于垂直于Ru-Ru键的野外方向，在观察到HIQTH效果的情况下，我们发现$κ（H）$中的不连续跳跃，在$ C（H）$中以$μ_0H^**\ of yout11 $ \ \ y of the of c（h）$中的峰值异常，t，t，证明了弱的第一阶相位过渡。值得注意的是，HIQTH效果消失了接近$ h^*$。此外，我们发现自旋裂缝功能远高于$ h^\ ast $。这些暗示着相变的出现，该相变为具有不同拓扑特性的两个QSL相。
The Kitaev quantum spin liquid (QSL) on the two-dimensional honeycomb lattice epitomizes an entangled topological state, where the spins fractionalize into Majorana fermions. This state has aroused tremendous interest because it harbors non-Abelian anyon excitations. The half-integer quantized thermal Hall (HIQTH) conductance observed in $α$-RuCl$_3$ is a key signature of these excitations. However, the fate of this topologically nontrivial state at intense fields remains largely elusive. Here, we report the thermal conductivity $κ$ and specific heat $C$ of $α$-RuCl$_3$ with in-plane magnetic fields $H$. For the field direction perpendicular to the Ru-Ru bond, where the HIQTH effect is observed, we find a discontinuous jump in $κ(H)$ and a peak anomaly in $C(H)$ at $μ_0H^*\approx11$\,T, evidencing a weak first-order phase transition. Remarkably, the HIQTH effect vanishes close to $H^*$. Furthermore, we find that the spin-fractionalization feature is retained well above $H^\ast$. These imply the emergence of the phase transition that separates two QSL phases with distinct topological properties.
