Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Aging and memory in a two-dimensional electron system in Si   The relaxations of conductivity after a temporary change of carrier density
n_s during the waiting time t_w have been studied in a strongly disordered
two-dimensional electron system in Si. At low enough n_s < n_g (n_g - the glass
transition density), the nonexponential relaxations exhibit aging and memory
effects at low temperatures T. The aging properties change abruptly at the
critical density for the metal-insulator transition n_c < n_g. The observed
complex dynamics of the electronic transport is strikingly similar to that of
other systems that are far from equilibrium.

8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn