Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Background charge fluctuation in a GaAs quantum dot device   We investigate background charge fluctuation in a GaAs quantum dot device by
measuring 1/f noise in the single-electron tunneling current through the dot.
The current noise is understood as fluctuations of the confinement potential
and tunneling barriers. The estimated potential fluctuation increases almost
linearly with temperature, which is consistent with a simple model of the 1/f
noise. We find that the fluctuation increases very slightly when electrons are
injected into excited states of the quantum dot.

12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
18
The categories of this paper are: econ
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn