期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 91, 期 12, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.7566/JPSJ.91.124703
关键词
-
资金
- Japan Society for the Promotion of Science [18H05227, 18H03680, 18H01180, 21K13881, 17H01142, 19K03711, JP19H05824, JP19H05825]
- JST CREST [JPMJCR19T5]
Researchers have found that the Kitaev quantum spin liquid on the two-dimensional honeycomb lattice undergoes a phase transition at intense magnetic fields, which may be a weak first-order transition. This transition affects the thermal Hall conductance of the topological state.
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 anyons. The half-integer quantized thermal Hall (HIQTH) conductance observed in alpha-RuCl3 is a key signature of the non-Abelian topological order. However, the fate of this topologically nontrivial state at intense fields remains largely elusive. Here, we report the thermal conductivity kappa and specific heat C of alpha-RuCl3 with in-plane magnetic fields H. For the field direction perpendicular to the Ru-Ru bond, where the HIQTH effect is observed, we find clear anomalies in kappa(H) and C(H) at mu H-0* approximate to 11 T, indicating the emergence of a phase transition between low- and high-field spin liquid phases. We point out that this phase transition is likely to be weak first-order. We also find that even well above H*, kappa(H) is highly anisotropic with respect to H-direction. This indicates that the high field phase is not in a simple spin-polarized state and spin-fractionalization may be retained. Intriguingly, the thermal Hall conductance of the same crystal deviates from the half-integer plateau near H*, suggesting that the topological properties are affected by this transition.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据