Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: SPECTRAL CORRELATIONS IN DISORDERED ELECTRONIC SYSTEMS: CROSSOVER FROM
  METAL TO INSULATOR REGIME   We use the semiclassical approach combined with the scaling results for the
diffusion coefficient to consider the two-level correlation function
$R(\varepsilon)$ for a disordered electron system in the crossover region,
characterized by the appearance of a macroscopic correlation or localization
length, $\xi$, that diverges at the metal-insulator transition. We show new
critical statistics, characterized by a nontrivial asymptotic behavior of
$R(\varepsilon)$, to emerge on both sides of the transition at higher energies,
and to expand to all energies larger than mean level spacing when $\xi$ exceeds
the system size.

37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex