论文标题
基塔夫旋转液体中依赖现场角度依赖的主要差异的热力学证据
Thermodynamic evidence for field-angle dependent Majorana gap in a Kitaev spin liquid
论文作者
论文摘要
二维蜂窝磁体的恰当可溶解的基塔伊夫模型导致以主要含量耐断层的拓扑量子计算相关的量子自旋液体（QSL）。在$α$ -RUCL3的高场磁磁状态下，据报道，热霍尔电导率的半数量化是边缘电流的签名，但该状态的批量性质仍然难以捉摸。在这里，从平面内场旋转下的高分辨率热容量测量值中，我们发现大量$α$ -RUCL3的角度依赖性低能激发非常依赖。激发差距具有分解节点结构，并且差距幅度随场的增加而增加，这与Kitaev模型中的巡回主体效率的预期完全一样。我们的热力学结果与运输量化属性完全相关，提供了基塔耶ev QSL中散装对应关系的首次演示。此外，在量子热大厅效应消失的较高场上，我们发现具有两倍旋转对称性的新型列QSL状态的可能出现。
The exactly-solvable Kitaev model of two-dimensional honeycomb magnet leads to a quantum spin liquid (QSL) characterized by Majorana fermions, relevant for fault-tolerant topological quantum computations. In the high-field paramagnetic state of $α$-RuCl3, half-integer quantization of thermal Hall conductivity has been reported as a signature of edge current, but the bulk nature of this state remains elusive. Here, from high-resolution heat capacity measurements under in-plane field rotation, we find strongly angle-dependent low-energy excitations in bulk $α$-RuCl3. The excitation gap has a sextuple node structure, and the gap amplitude increases with field, exactly as expected for itinerant Majorana fermions in the Kitaev model. Our thermodynamic results are fully linked with the transport quantization properties, providing the first demonstration of the bulk-edge correspondence in a Kitaev QSL. Moreover, at higher fields where the quantum thermal Hall effect vanishes, we find the possible emergence of a novel nematic QSL state with two-fold rotational symmetry.
