  Effects related with deviations from thermodynamic equilibrium take a special
place in the modern physics. Among those, non-equilibrium phenomena in quantum
systems attract the highest interest. To date, the experimental technique of
spin noise spectroscopy has became quite widespread, which makes possible to
observe spin fluctuations of charge carriers in semiconductors both in
equilibrium and non-equilibrium conditions. It calls for development of the
theory of spin fluctuations of electrons and electron-hole complexes for
non-equilibrium conditions. In this paper we consider a range of physical
situations where a deviation from an equilibrium becomes pronounced in the spin
noise. A general method of calculation of electron and exciton spin
fluctuations in non-equilibrium state is proposed. A short review of
theoretical and experimental results in this area is given.
