Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The role of Coulomb correlation in charge density wave of CuTe   A quasi one-dimensional layered material, CuTe undergoes a charge density
wave (CDW) transition in Te chains with a modulation vector of $q_{CDW}=(0.4,
0.0, 0.5)$. Despite the clear experimental evidence for the CDW, the
theoretical understanding especially the role of the electron-electron
correlation in the CDW has not been fully explored. Here, using first
principles calculations, we demonstrate the correlation effect of Cu is
critical to stabilize the 5$\times$1$\times$2 modulation of Te chains. We find
that the phonon calculation with the strong Coulomb correlation exhibits the
imaginary phonon frequency so-called phonon soft mode at $q_{ph0}=(0.4, 0.0,
0.5)$ indicating the structural instability. The corresponding lattice
distortion of the soft mode agrees well with the experimental modulation. These
results demonstrate that the CDW transition in CuTe originates from the
interplay of the Coulomb correlation and electron-phonon interaction.

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The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int