Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interband electron pairing for superconductivity from the breakdown of
  the Born-Oppenheimer approximation   The origin of interband electron pairing responsible for enhancing
superconductivity and the factors controlling its strength were examined. We
show that the interband electron pairing is a natural consequence of breaking
down the Born-Oppenheimer approximation during the electron-phonon
interactions. Its strength is determined by the pair-state excitations around
the Fermi surfaces that take place to form a superconducting state. Fermi
surfaces favorable for the pairing were found and its implications were
discussed.

26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat