Real spin and pseudospin topologies in the noncentrosymmetric topological nodal-line semimetal CaAgAs

@article{Hirose2020RealSA,
  title={Real spin and pseudospin topologies in the noncentrosymmetric topological nodal-line semimetal CaAgAs},
  author={H. Hirose and T. Terashima and T. Wada and Y. Matsushita and Y. Okamoto and K. Takenaka and S. Uji},
  journal={Physical Review B},
  year={2020},
  volume={101},
  pages={245104}
}
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 $\ensuremath{\beta}$ and $\ensuremath{\gamma}$ 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 $\ensuremath{\beta}$ arises… Expand
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