Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: From the Fermi glass towards the Mott insulator in one dimension:
  Delocalization and strongly enhanced persistent currents   When a system of spinless fermions in a disordered mesoscopic ring becomes
instable between the inhomogeneous configuration driven by the random potential
(Anderson insulator) and the homogeneous one driven by repulsive interactions
(Mott insulator), the persistent current can be enhanced by orders of
magnitude. This is illustrated by a study of the change of the ground state
energy under twisted boundary conditions using the density matrix
renormalization group algorithm.

16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
3
The categories of this paper are: physics
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex