Abstract:
In this paper, we give a review of our recent successes in the further development
of the density matrix theory to describe the nonequilibrium charge dynamics in
semiconductor systems with open electron shells. They are considered two
approaches to describe these systems. In the first, systems with a negligibly small
spin-orbit coupling are examined, where the description of the electron dynamics
is reduced to separate consideration of electrons with different spin directions.
If the spin-orbit interaction cannot be neglected, the charge dynamics can be
described in the basis of two-component spinors, where spin-flip transitions are
allowed. Examples of practical use of the theory in specific cases are given for both
methods of description.
