Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Metal-insulator transition in correlated two-dimensional systems with
  disorder   Experimental evidence for the possible universality classes of the
metal-insulator transition (MIT) in two dimensions (2D) is discussed.
Sufficiently strong disorder, in particular, changes the nature of the
transition. Comprehensive studies of the charge dynamics are also reviewed,
describing evidence that the MIT in a 2D electron system in silicon should be
viewed as the melting of the Coulomb glass. Comparisons are made to recent
results on novel 2D materials and quasi-2D strongly correlated systems, such as
cuprates.

25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn