Quantum fluctuations of Coulomb potential as a source of Flicker noise: The influence of a heat bathстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The power spectrum of finite-temperature quantum electromagnetic
fluctuations produced by elementary charge carriers under the influence of
external electric field is investigated. It is found that under the combined action
of the photon heat bath and the external field, the lower-frequency asymptotic of
the power spectrum is modified both qualitatively and quantitatively. The new
term in the power spectrum is inversely proportional to frequency, but is odd
with respect to it. It comes from the connected part of the correlation function,
and is related to the temperature and external field corrections to the photon and
charge carrier propagators. In application to the case of a biased conducting
sample, this term gives rise to a contribution to the voltage power spectrum
which is proportional to the absolute system temperature, the charge carrier
mobility, the bias voltage squared, and a factor describing dependence of the
noise intensity on the sample geometry. It is verified that the derived expression
is in agreement with the experimental data on 1/f -noise measurements inmetal
films. It is shown also that the obtained result provides a natural resolution to
the problem of divergence of the total noise power.