论文标题
由单层α-rucl3中的结构对称性破坏驱动的磁各向异性逆转
Magnetic anisotropy reversal driven by structural symmetry-breaking in monolayer α-RuCl3
论文作者
论文摘要
分层的α-RUCL3是一种有前途的材料，可以潜在地实现带有分数激发的长期以来的Kitaev量子自旋液体。尽管已经在适度的平面磁场下报道了这种异国情调状态的证据，但这种行为与仅在平面外田间出现的基塔夫阶段的理论期望不一致。但是，由于散装晶体的易于平面各向异性，这些预测的野外诱导状态大多是无法触及的。我们结合了隧道光谱，磁转运，电子衍射和从头算计算，以研究原子薄样品中依赖层依赖的木蛋白，各向异性，结构和交换耦合。由于结构扭曲，单层α-Rucl3平均非对角线交换变化的迹象导致磁各向异性逆转为易于轴。我们的工作提供了一种新的途径来调整α-Rucl3中的磁相互作用，并允许理论上预测的量子自旋液相对于平面外场更具实验性访问。
Layered α-RuCl3 is a promising material to potentially realize the long-sought Kitaev quantum spin liquid with fractionalized excitations. While evidence of this exotic state has been reported under a modest in-plane magnetic field, such behavior is largely inconsistent with theoretical expectations of Kitaev phases emerging only in out-of-plane fields. These predicted field-induced states have been mostly out of reach due to the strong easy-plane anisotropy of bulk crystals, however. We use a combination of tunneling spectroscopy, magnetotransport, electron diffraction, and ab initio calculations to study the layer-dependent magnons, anisotropy, structure, and exchange coupling in atomically thin samples. Due to structural distortions, the sign of the average off-diagonal exchange changes in monolayer α-RuCl3, leading to a reversal of magnetic anisotropy to easy-axis. Our work provides a new avenue to tune the magnetic interactions in α-RuCl3 and allows theoretically predicted quantum spin liquid phases for out-of-plane fields to be more experimentally accessible.
