Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Possible Structural Transformation and Enhanced Magnetic Fluctuations in
  Exfoliated $\alpha$-RuCl$_3$   We present initial Raman spectroscopy experiments on exfoliated flakes of
$\alpha$-RuCl$_3$, from tens of nm thick down to single layers. Besides
unexpectedly finding this material to be air stable, in the thinnest layers we
observe the appearance with decreasing temperature of a symmetry-forbidden mode
in crossed polarization, along with an anomalous broadening of a mode at 164
cm$^{-1}$ that is known to couple to a continuum of magnetic excitations. This
may be due to an enhancement of magnetic fluctuations and evidence for a
distorted honeycomb lattice in single- and bi-layer samples.

10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga