2006 − present: National Research University of Information Technologies, Mechanics and Optics, St-Petersburg (ITMO University)
It was proposed the multiband pattern of the multiphoton avalanche effect that leads to the nonlinear generation of free carriers in the crystals in the picosecond’s time scale. Results of computer simulation of kinetic processes participated in the effect show that multiphoton avalanche is more efficient mechanism of generation of free carriers than routine multiphoton transitions. Also I have calculated the probabilities of multiphoton transitions in three band crystal in double resonance conditions. The existence of double resonance caused by the optical Stark effect leads to the appearance of new critical points in the density of states. Performed calculations show that the probabilities of multiphoton transitions in such conditions increase for some orders of magnitude contrary to the single multiphoton resonance.
2001 − 2006 Vavilov State Optical Institute, St. Petersburg
In the theoretical group of Prof. Eugene Perlin I have performed the calculation of the probabilities of Auger-type transitions in the quantum well systems and indirect bandgap semiconductors. Such transitions assisted by photon or not play substantial role in the origin of the photon avalanche effect. The computer simulation of avalanche process has occurred by solving of system nonlinear differential equations for carrier’s concentrations for energetic bands.
Research activity revolves around the theoretical investigation of nonlinear optical effects in the crystals viz to multiphoton transitions in the bulk and on the surface of the semiconductors of different dimensions; pre-breakdown generation of free carriers in the insulators and semiconductors caused by the ultra short pulse laser radiation; photon avalanche effect in the semiconductors and heterostructures, and dynamical Stark effect. My research interest involves the theoretical investigation of laser cooling of solids, namely doped crystal systems and semiconductor materials.