Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charge-density waves in kagome-lattice extended Hubbard models at the
  van Hove filling   The Hubbard model on the kagome lattice is presently often considered as a
minimal model to describe the rich low-temperature behavior of AV$_{3}$Sb$_{5}$
compounds (with A=K, Rb, Cs), including charge-density waves (CDWs),
superconductivity, and possibly broken time-reversal symmetry. Here, we
investigate, via variational Jastrow-Slater wave functions, the properties of
its ground state when both onsite $U$ and nearest-neighbor $V$ Coulomb
repulsions are considered at the van Hove filling. Our calculations reveal the
presence of different interaction-driven CDWs and, contrary to previous
renormalization-group studies, the absence of ferromagnetism and charge- or
spin-bond order. No signatures of chiral phases are detected. Remarkably, the
CDWs triggered by the nearest-neighbor repulsion possess charge
disproportionations that are not compatible with the ones observed in
AV$_{3}$Sb$_{5}$. As an alternative mechanism to stabilize charge-bond order,
we consider the electron-phonon interaction, modeled by coupling the hopping
amplitudes to quantum phonons, as in the Su-Schrieffer-Heeger model. Our
results show the instability towards a tri-hexagonal distortion with $2\times
2$ periodicity, in a closer agreement with experimental findings.

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The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs