Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Correlation energy of two-dimensional systems: Toward non-empirical and
  universal modeling   The capability of density-functional theory to deal with the ground-state of
strongly correlated low-dimensional systems, such as semiconductor quantum
dots, depends on the accuracy of functionals developed for the exchange and
correlation energies. Here we extend a successful approximation for the
correlation energy of the three dimensional inhomogeneous electron gas,
originally introduced by Becke [J. Chem. Phys. {\bf 88}, 1053 (1988)], to the
two-dimensional case. The approach aims to non-empirical modeling of the
correlation-hole functions satisfying a set of exact properties. Furthermore,
the electron current and spin are explicitly taken into account. As a result,
good performance is obtained in comparison with numerically exact data for
quantum dots with varying external magnetic field, and for the homogeneous
two-dimensional electron gas, respectively.

22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th