Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electronic structures and optical spectra of thin anatase TiO2 nanowires
  through hybrid density functional and quasiparticle calculations   The electronic properties of quasi-one-dimensional anatase TiO2
nanostructures, in the form of thin nanowires having (101) and (001) facets,
have been systematically investigated using the standard, hybrid density
functional and quasiparticle calculations. Their visible photoabsorption
characteristics have also been studied at these levels of theories. The thin
stoichiometric nanowire models are predicted to have larger band gaps relative
to their bulk values. The band gap related features appear to be better
described with the screened Coulomb hybrid density functional method compared
to the standard exchange-correlation schemes. Depending on the self-consistency
in the perturbative GW methods, even larger energy corrections have been
obtained for the band gaps of both (101) and (001) titanium dioxide nanowires.

19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom