Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of chiral solitons in the quantum spin liquid phase of
  LiCuVO$_4$   Quantum spin liquids represent a magnetic ground state arising in the
presence of strong quantum fluctuations that preclude ordering down to zero
temperature and leave clear fingerprints in the excitation spectra. While
theory bears a variety of possible quantum spin liquid phases their
experimental realization is still scarce. Here, we report the first
experimental evidence of a vector-chiral quantum spin liquid state in the
$S=1/2$ spin chain compound LiCuVO$_4$ from measurements of the complex
permittivity $\varepsilon^*$ in the GHz range. In zero magnetic field our
results show short-lived thermally activated chiral fluctuations above the
multiferroic phase transition at $T_\mathrm{N}=2.4$ K with divergent life-times
when approaching $T_\mathrm{N}$. In $\varepsilon^*$ this fluctuation dynamics
are seen as the slowing down of a relaxation with a critical dynamical exponent
$\nu_\xi z \approx 1.3$ in agreement with mean-field predictions. When using a
magnetic field to suppress $T_N$ towards 0 K the influence of quantum
fluctuations is increased until they condense into the chrial spin liquid phase
below 400 mK. Within this phase we measure a nearly-gapless chiral soliton
excitation with a tiny energy gap of $E_\mathrm{SE}\approx14.1$ $\mu$eV.

10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
2
The categories of this paper are: math