Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Band structures and direct-to-indirect bandgap transitions in BAlN and
  BGaN alloys: a first principle study   In this work, the energy band structures of BGaN and BAlN alloys are
systematically studied through first-principles calculation using HSE hybrid
density functional theory by MedeA-VASP. Direct-indirect bandgap transition of
BGaN alloys at B content around 44% and that of BAlN alloys at B content about
24% have been identified. The variation of electron and hole effective masses
of both materials at different B compositions have also been demonstrated. A
large change in hole effective masses of BGaN and BAlN alloys from B=0% to 25%
has been observed. Finally, a picture of energy bandgap versus lattice constant
of III-nitride family with boron is shown.

8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio