Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electron linewidths of wide--gap insulators: excitonic effects in LiF   Based on a recent exchange--correlation kernel developed within
Time--Dependent--Density--Functional Theory we derive a practical and general
expression for the three--point vertex function. We show that excitonic effects
in LiF strongly modifies the low--energy electron linewidths leading to linear
scaling with quasiparticle energy. We also prove that, in contrast to previous
results for the electron gas, simple metals and semiconductors, vertex
corrections in the self--energy and in the screening function do not compensate
each other.

37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph