Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Catalogue of phonon modes in several cuprate high-temperature
  superconductors from density functional theory   Cuprates are promising candidates for study in developing higher temperature
superconductors. A thorough understanding of a material's phonon modes enables
further investigation of its emergent properties, however, no complete
reference of the phonon modes exists. Here, using density functional theory, we
evaluate the phonon frequencies and atomic displacements for
$\text{La}_2\text{CuO}_4$, $\text{Bi}_2\text{Sr}_2\text{CuO}_6$, and
$\text{Bi}_2\text{Sr}_2\text{CaCu}_2\text{O}_8$ in their tetragonal structures.
The phonon modes for all materials agree with those expected from space group
symmetry and display instabilities corresponding to known low-temperature
structural phase transitions.

15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas