Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Band gap opening at the Dirac point in Co/BiSbTeSe2(0001) system   Sub-angstrom Co coverage, being deposited on BiSbTeSe2(0001) surface at
200-330 C, opens a band gap at the Dirac point, with the shift of the Dirac
point position caused by RT adsorbate pre-deposition. Temperature dependent
measurements in 15-150 K range have shown no band gap width change. This fact
indicates the nonmagnetic nature of the gap which may be attributed to the
chemical hybridization of surface states upon the introduction of Co adatoms,
which decrease crystallographic symmetry and eliminate topological protection
of the surface states.

8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn