论文标题
Kitaev Spin-Liquid候选$α$ -rucl $ _3 $的量化和未量化的热厅电导
Quantized and unquantized thermal Hall conductance of Kitaev spin-liquid candidate $α$-RuCl$_3$
论文作者
论文摘要
尽管进行了广泛的研究，但在磁场引起的基塔夫候选材料的量子失调状态$α$ -rucl $ _3 $中托管Majorana边缘模式的拓扑状态已引起人们的争论。为了获得有关此问题的更多信息，我们测量了由Bridgman方法生长的各种样品的暖缸电导率$κ_{xy} $。结果表明，半数量子量子热室效应与纵向导热率和零场的néel温度密切相关，这两种温度均取决于样品。表现出半级量子热室效应的样品的零场导热率值比阈值值更大，这意味着较长的平均热载体的平均自由路径是重要的先决条件。此外，我们发现具有较高Néel温度的样品表现出较高的磁场开始发生量化。这些结果表明，量化现象受杂质散射和非基塔伊夫相互作用的显着影响。
Despite extensive investigations, a topological state that hosts Majorana edge modes in the magnetic field-induced quantum disordered state of the Kitaev candidate material $α$-RuCl$_3$ has been hotly debated. To gain more insight into this issue, we measured the thermal Hall conductivity $κ_{xy}$ of various samples grown by the Bridgman method. The results show that the half-integer quantum thermal Hall effect is intimately related to the magnitude of longitudinal thermal conductivity and the Néel temperature at zero field, both of which are sample dependent. Samples exhibiting the half-integer quantum thermal Hall effect have larger zero-field thermal conductivity values than a threshold value, implying that a long mean free path of heat carriers is an important prerequisite. In addition, we find that samples with a higher Néel temperature exhibit a higher magnetic field at which quantization starts to occur. These results indicate that the quantization phenomenon is significantly affected by the impurity scatterings and the non-Kitaev interactions.
