Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Temperature dependent excitonic effects in the optical properties of
  single-layer MoS$_2$   Temperature influences the performance of two-dimensional materials in
optoelectronic devices. Indeed, the optical characterization of these materials
is usually realized at room temperature. Nevertheless most {\it ab-initio}
studies are yet performed without including any temperature effect. As a
consequence, important features are thus overlooked, such as the relative
intensity of the excitonic peaks and their broadening, directly related to the
temperature and to the non-radiative exciton relaxation time. We present {\it
ab-initio} calculations of the optical response of single-layer MoS$_2$, a
prototype 2D material, as a function of temperature using density functional
theory and many-body perturbation theory. We compute the electron-phonon
interaction using the full spinorial wave functions, i.e., fully taking into
account effects of spin-orbit interaction. We find that bound excitons ($A$ and
$B$ peaks) and resonant excitons ($C$ peak) exhibit different behavior with
temperature, displaying different non-radiative linewidths. We conclude that
the inhomogeneous broadening of the absorption spectra is mainly due to
electron-phonon scattering mechanisms. Our calculations explain the
shortcomings of previous (zero-temperature) theoretical spectra and match well
with the experimental spectra acquired at room temperature. Moreover, we
disentangle the contributions of acoustic and optical phonon modes to the
quasi-particles and exciton linewidths. Our model also allows to identify which
phonon modes couple to each exciton state, useful for the interpretation of
resonant Raman scattering experiments.

27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn