Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Noncentrosymmetric compensated half-metal hosting pure spin Weyl nodes,
  triple nodal points, nodal loops, and nexus fermions   Materials containing multiple topological characteristics become more exotic
when combined with noncentrosymmetric crystal structures and unusual magnetic
phases such as the compensated half-metal state, which is gapped in one spin
direction and conducting in the other. First principles calculations reveal
these multiple topological features in the compensated half-metal Cr$_2$CoAl
having neither time-reversal nor inversion symmetries. In the absence of
(minor) spin-orbit coupling (SOC), there are (1) a total of twelve pairs of
magnetic Weyl points, (2) three distinct sets of triple nodal points near the
Fermi level that are (3) interconnected with six symmetry related nodal lines.
This combination gives rise to fully spin polarized nexus fermions, in a system
with broken time-reversal symmetry but negligible macroscopic magnetic field.
The observed high Curie temperature of 750 K and calculated SOC hybridization
mixing of several meV should make these nexus fermions readily measurable.
Unlike topological features discussed for other Heuslers which emphasize their
strong ferromagnetism, this compensated half-metal is impervious to typical
magnetic fields, thus providing a complementary set of experimental phenomena.
Making use of the soft calculated magnetic state, large magnetic fields can be
used to rotate the direction of magnetism, during which certain topological
features will evolve. Our results suggest that these features may be common in
inverse-Heusler systems, particularly the isostructural and isovalent Ga and In
analogs.

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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: adap-org
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th
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The categories of this paper are: funct-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int