Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ab initio study on lattice thermal conductivity of Cu$_2$O using GGA and
  hybrid density functional methods   Lattice thermal conductivity of Cu$_2$O was studied using ab initio density
functional methods. The performance of generalized gradient approximation,
GGA-PBE, and PBE0 exchange-correlation functionals was compared for various
electronic and phonon-related properties. 3d transition metal oxides such as
Cu$_2$O are known to be a challenging case for pure GGA functionals and in
comparison to GGA-PBE the PBE0 hybrid functional clearly improves the
description of both electronic and phonon-related properties. The most striking
difference is found in the lattice thermal conductivity, where GGA
underestimates it as much as 40% in comparison to experiment, while the
difference between the experiment and the PBE0 hybrid functional is only a few
percent.

28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
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The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg