Excitons, beexcitons, electron-hole liquid. Non-equilibrium
processes in high external fields in semiconductors.
The main results:
Diagram technique for non-stationary processes was developed in 1964.
A theory of electron-hole liquid was proposed which predicted the formation
of droplets of such liquid in semiconductors.
A great variety of unusual nonlinear optical effects in semiconductors in
high electromagnetic fields was described, which are connected with
collective effects in coherent high density electron-hole system.
non-stationary collective processes in electron-hole
systems, istabilities of exciton and biexciton types.