论文标题
在非中心拓扑结节线半径caagas中的真实自旋和假蛋白拓扑
Real spin and pseudospin topologies in the noncentrosymmetric topological nodal-line semimetal CaAgAs
论文作者
论文摘要
我们介绍了由de haas-van alphen（DHVA）效应测量结果结合起来计算的caagas的自旋分裂费米表面的拓扑拓扑。我们已经从$β$和$γ$轨道的DHVA振荡中确定了圆环形状的鼻线费米表面。前轨道环绕着节点线，而后者则没有。然而，两个轨道都发现了一个非平凡的浆果阶段。 $β$的非平凡阶段来自轨道特征，轨道特征可以表达为伪装围绕节点线旋转的伪s。另一方面，$γ$的相位归因于由反对称自旋轨道相互作用引起的真实自旋纹理的涡流。我们的结果表明，在解释非中心淋巴结线半度法中的电子拓扑时，实际和伪旋转纹理都是必不可少的。
We present the topology of spin-split Fermi surface of CaAgAs as determined by de Haas-van Alphen (dHvA) effect measurements combined with ab initio calculations. We have determined the torus-shaped nodal-line Fermi surface from the dHvA oscillations of $β$ and $γ$ orbits. The former orbit encircles the nodal-line, while the latter does not. Nevertheless, a nontrivial Berry phase is found for both orbits. The nontrivial phase of $β$ arises from the orbital characters, which can be expressed as a pseudospin rotating around the nodal-line. On the other hand, the phase of $γ$ is attributed to the vortex of real spin texture induced by an antisymmetric spin-orbit interaction. Our result demonstrates that both the real- and pseudo-spin textures are indispensable in interpreting the electronic topology in noncentrosymmetric nodal-line semimetals.
