Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The effect of electron-phonon interactions on the spectral properties of
  single defects in hexagonal boron nitride   We investigate temperature-dependent spectral properties of a single defect
in hexagonal boron nitride (hBN). We observe a sharp zero-phonon line (ZPL)
emission accompanied by Stokes and anti-Stokes optical phonon sidebands
assisted by the Raman active low-energy ($\approx~6.5$ meV) interlayer shear
mode of hBN. Spectral lineshape around the ZPL is measured down to 78 K, at
which the linewidth of the ZPL is measured as 172 $\mu$eV. By employing a
quadratic electron-phonon interaction, the temperature-dependent broadening and
the lineshift of the ZPL are found to follow $T+T^5$ and $T+T^3$ temperature
dependence, respectively. Furthermore, the temperature-dependent lineshape
around the ZPL is modeled with a linear electron-phonon coupling theory, which
results in the Debye-Waller factor of the ZPL emission as 0.59.

20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con