Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of Raman active phonon with Fano lineshape in
  quasi-one-dimensional superconductor K$_2$Cr$_3$As$_3$   We performed a polarized Raman scattering study of quasi-one-dimensional
superconductor K$_2$Cr$_3$As$_3$. We detect two A$_1^\prime$ phonons and three
E$^\prime$ phonons. One of the A$_1^\prime$ modes exhibits a nearly
temperature-independent Fano lineshape. Based on our first-principles
calculations, we ascribe this mode to the in-phase vibrations of Cr atoms
within one layer. This observation strongly suggests that the magnetic
fluctuations in K$_2$Cr$_3$As$_3$ are coupled to the electronic structure
\emph{via} the lattice.

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The categories of this paper are: math-ph
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The categories of this paper are: stat
34
The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: nucl-th
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The categories of this paper are: eess
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-lat
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The categories of this paper are: funct-an
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The categories of this paper are: supr-con
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The categories of this paper are: physics
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio