Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theory of absorption lineshape in monolayers of transition metal
  dichalcogenides   The linear absorption spectra in monolayers of transition metal
dichalcogenides show pronounced signatures of the exceptionally strong
exciton-phonon interaction in these materials. To account for both exciton and
phonon physics in such optical signals, we compare different theoretical
methods to calculate the absorption spectra using the example of
$\mathrm{MoSe_2}$. In this paper, we derive the equations of motion for the
polarization either using a correlation expansion up to 4th Born approximation
or a time convolutionless master equation. We show that the Born approximation
might become problematic when not treated in high enough order, especially at
high temperatures. In contrast, the time convolutionless formulation gives
surprisingly good results despite its simplicity when compared to higher-order
corrrelation expansion and therefore provides a powerful tool to calculate the
lineshape of linear absorption spectra in the very popular monolayer materials.

19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin