Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Half-Heusler alloy LiBaBi: A new topological semimetal with five-fold
  band degeneracy   Based on first-principles study, we report the finding of a new topological
semimetal LiBaBi in half-Heusler phase. The remarkable feature of this
nonmagnetic, inversion-symmetry-breaking material is that it consists of only
simple $s$- and $p$-block elements. Interestingly, the material is ordinary
insulator in the absence of spin-orbit coupling (SOC) and becomes nodal-surface
topological semimetal showing drumhead states when SOC is included. This is in
stark contrast to other nodal-line and nodal-surface semimetals, where the
extended nodal structure is destroyed once SOC is included. Importantly, the
linear band crossings host three-, four-, five- and six-fold degeneracies near
the Fermi level, making this compound very attractive for the study of
`unconventional' fermions. The band crossing points form a three-dimensional
nodal structure around the zone center at the Fermi level. We identify the
surface states responsible for the appearance of the drumhead states. The alloy
also shows a phase transition from topological semimetal to a trivial insulator
on application of pressure. In addition to revealing an intriguing effect of
SOC on the nodal structure, our findings introduce a new half-Heusler alloy in
the family of topological semimetals, thus creating more avenues for
experimental exploration.

36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas