Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strong-coupling electron-phonon superconductivity in noncentrosymmetric
  quasi-one-dimensional K$_2$Cr$_3$As$_3$   I study the lattice dynamics and electron-phonon coupling in
non-centrosymmetric quasi-one-dimensional K$_2$Cr$_3$As$_3$ using density
functional theory based first principles calculations. The phonon dispersions
show stable phonons without any soft-mode behavior. They also exhibit features
that point to a strong interaction of K atoms with the lattice. I find that the
calculated Eliashberg spectral function shows a large enhancement around 50
cm$^{-1}$. The phonon modes that show large coupling involve in-plane motions
of all three species of atoms. The $\mathbf{q}$ dependent electron-phonon
coupling decreases strongly away from the $q_z = 0$ plane. The total
electron-phonon coupling is large with a value of $\lambda_{\textrm{ep}} =
3.0$, which readily explains the experimentally observed large mass
enhancement.

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The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: solv-int
2
The categories of this paper are: math
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The categories of this paper are: nlin
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The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph