Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence for a quantum dipole liquid state in an organic
  quasi-two-dimensional material   Mott insulators are commonly pictured with electrons localized on lattice
sites. Their low-energy degrees of freedom involve spins only. Here we observe
emerging charge degrees of freedom in a molecule-based Mott insulator
$\kappa$-(BEDT-TTF)$_2$Hg(SCN)$_2$Br, resulting in a quantum dipole liquid
state. Electrons localized on molecular dimer lattice sites form electric
dipoles that do not order at low temperatures and fluctuate with frequency
detected experimentally in our Raman spectroscopy experiments. The heat
capacity and Raman scattering response are consistent with a scenario where the
composite spin and electric dipole degrees of freedom remain fluctuating down
to the lowest measured temperatures.

16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex