Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single Pair of Weyl Points in Nonmagnetic Crystals   Topological semimetal states having the minimal number, i.e., only a single
pair, of Weyl points are desirable for the study of effects associated with
chiral topological charges. So far, the search for such states is focused on
magnetic spinful systems. Here, we find that nonmagnetic spinless systems can
host a class of single-pair-Weyl-point (SP-WP) states, where the two Weyl
points are located at two high-symmetry time-reversal-invariant momenta. We
identify 32 candidate space groups that host such states, and we show that the
chiral charge of each Weyl point in the SP-WP state must be an even integer.
Besides achieving the minimal number, Weyl points in SP-WP states are far
separated in momentum space, making the physics of each individual point better
exposed. The large separation combined with the even topological charge lead to
extended surface Fermi loops with a non-contractible winding topology on the
surface Brillouin zone torus, distinct from conventional Weyl semimetals. We
confirm our proposal in the phonon spectra of two concrete materials TlBO$_2$
and KNiIO$_6$. Our finding applies to a wide range of systems, including
electronic, phononic, and various artificial systems. It offers a new direction
for the search of ideal platforms to study chiral particles.

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The categories of this paper are: hep-th
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The categories of this paper are: solv-int
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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: supr-con
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The categories of this paper are: bayes-an
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The categories of this paper are: math-ph
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The categories of this paper are: physics
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The categories of this paper are: q-bio
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The categories of this paper are: gr-qc
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The categories of this paper are: chao-dyn
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The categories of this paper are: astro-ph
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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: cs
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The categories of this paper are: dg-ga