Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Real spin and pseudospin topologies in the noncentrosymmetric
  topological nodal-line semimetal CaAgAs   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 $\beta$ and $\gamma$ 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 $\beta$ arises
from the orbital characters, which can be expressed as a pseudospin rotating
around the nodal-line. On the other hand, the phase of $\gamma$ 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.

1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph