Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Band structure and unconventional electronic topology of CoSi   Crystalline semimetals with certain space group symmetries may possess
unusual electronic structure topology, distinct from the conventional Weyl and
Dirac semimetals. Characteristic property of these materials is the existence
of band-touching points with multiple (higher than two-fold) degeneracy and
nonzero topological charge. CoSi is a representative of this group of materials
exhibiting the so-called "new fermions". We report on an ab initio calculation
of the electronic structure of CoSi using density functional methods, taking
into account the spin-orbit interactions. We demonstrate the existence of
band-touching nodes with four- and six-fold degeneracy, located at the $\Gamma$
and $R$ points in the first Brillouin zone and near the Fermi energy. We show
that these band-touching points carry topological charges of $\pm 4$ and
describe the resulting Fermi arc surface states, connecting the projections of
these nodes onto the surface Brillouin zone. We also discuss the influence of
many body $G_0W_0$ corrections on the electronic band structure and the
topological properties of CoSi.

11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics