Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Screening in 2D: GW calculations for surfaces and thin films using the
  repeated-slab approach   In the context of photoelectron spectroscopy, the $GW$ approach has developed
into the method of choice for computing excitation spectra of weakly correlated
bulk systems and their surfaces. To employ the established computational
schemes that have been developed for three-dimensional crystals,
two-dimensional systems are typically treated in the repeated-slab approach. In
this work we critically examine this approach and identify three important
aspects for which the treatment of long-range screening in two dimensions
differs from the bulk: (1) anisotropy of the macroscopic screening (2) $\mathbf
k$-point sampling parallel to the surface (3) periodic repetition and slab-slab
interaction. For prototypical semiconductor (silicon) and ionic (NaCl) thin
films we quantify the individual contributions of points (1) to (3) and develop
robust and efficient correction schemes derived from the classic theory of
dielectric screening.

32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math