Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Extremely large magnetoresistance and high-density Dirac-like fermions
  in ZrB2   We report the detailed study on transport properties of ZrB2 single crystal,
a predicted topological nodal-line semimetal. ZrB2 exhibits extremely large
magnetoresistance as well as field-induced resistivity upturn and plateau.
These behaviors can be well understood by the two-band model with the perfect
electron - hole compensation and high carrier mobilities. More importantly, the
electrons with small effective masses and nontrivial Berry phase have
significantly high density when compared to those in known topological
semimetals. It strongly suggests that ZrB2 hosts Dirac-like nodal-line
fermions.

29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci