Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Origin of the Type-II Weyl state in topological antiferromagnetic
  YbMnBi2   Recently, the topological nature of an antiferromagnet YbMnBi2 has been
controversial. YbMnBi2 is regarded as a candidate of Type-II Weyl semimetals
with magnetic moments of Mn atoms canting about 10{\deg} in some studies but as
a Dirac semimetal without canting in others. By means of systematical density
functional theory calculations, we show the perfect YbMnBi2 bulk has a
collinear antiferromagnetic ordering and, naturally, it is a Dirac semimetal.
Considering the vital role of magnetic moment canting in generating the Type-II
Weyl state, we artificially cant the magnetic moments of Mn atoms and find that
YbMnBi2 enters into the Type-II Weyl state from about 2{\deg}. Inspired by this
and taking into account the possible defects in experiments, we suggest that Bi
vacancies in Mn-Bi-Mn bonds, which produce sizable Dzyaloshinskii-Moriya
interactions and thereby cant the magnetic moments of Mn atoms, can tune the
topological nature of YbMnBi2 from Dirac semimetals to Type-II Weyl semimetals.
Our work unveils the possible underlying mechanism for the Type-II Weyl state
in YbMnBi2, providing insights into the Weyl state in other magnetic
topological materials.

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The categories of this paper are: supr-con
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The categories of this paper are: econ
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
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The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: q-bio