Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Fluctuations of Coulomb Potential as a Source of Flicker Noise.
  The Influence of External Electric Field   Fluctuations of the electromagnetic field produced by quantized matter in
external electric field are investigated. A general expression for the power
spectrum of fluctuations is derived within the long-range expansion. It is
found that in the whole measured frequency band, the power spectrum of
fluctuations exhibits an inverse frequency dependence. A general argument is
given showing that for all practically relevant values of the electric field,
the power spectrum of induced fluctuations is proportional to the field
strength squared. As an illustration, the power spectrum is calculated
explicitly using the kinetic model with the relaxation-type collision term.
Finally, it is shown that the magnitude of fluctuations produced by a sample
generally has a Gaussian distribution around its mean value, and its dependence
on the sample geometry is determined. In particular, it is demonstrated that
for geometrically similar samples, the power spectrum is inversely proportional
to the sample volume. Application of the obtained results to the problem of
flicker noise is discussed.

9
The categories of this paper are: nlin
1
The categories of this paper are: cs
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex