Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strain dependence of photoluminescence and circular dichroism in
  transition metal dichalcogenides: a k.p analysis   Within a two-band $k\cdot p$ method we analyze different types of strain for
the $K$ valley optical characteristics of a freestanding monolayer MoS$_2$,
MoSe$_2$, WS$_2$ and WSe$_2$. We predict that circular polarization selectivity
for energies above the direct transition onset deteriorates/improves by
tensile/compressive strain. Wide range of available strained-sample
photoluminescence data can be reasonably reproduced by this simple
bandstructure combined with accounting for excitons at a variational level.
According to this model strain impacts optoelectronic properties through its
hydrostatic component, whereas the shear strain only causes a rigid wavevector
shift of the valley. Furthermore, under the stress loading of flexible
substrates the presence of Poisson's effect or the lack of it are examined
individually for the reported measurements.

24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th