Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Semi-empirical many-body formalism of optical absorption in nanosystems
  and molecules   A computationally efficient Green's function approach is developed to
evaluate the optical properties of nanostructures using a GW formalism applied
on top of a tight-binding and mean-field Hubbard model. The use of the GW
approximation includes key parts of the many-body physics that govern the
optical response of nanostructures and molecules subjected to an external
electromagnetic field. Such description of the electron-electron correlation
yields data that are in significantly improved agreement with experiments
performed on a subset of polycyclic aromatic hydrocarbons (PAHs) considered for
illustrative purpose. More generally, the method is applicable to any structure
whose electronic properties can be described in first approximation within a
mean-field approach and is amenable for high-throughput studies aimed at
screening materials with desired optical properties.

32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
18
The categories of this paper are: econ
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an