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	Viktor E. Bursian Ph.D., Researcher A.F.Ioffe Physical-Technical Institute, 26 Politekhnicheskaya ul., 194021 Sankt-Petersburg, Russia fax: +7 (812) 247-10-17 phones: +7 (812) 247-99-11, +7 (812) 247-91-74 e-mail: Viktor.Bursian@mail.ioffe.ru




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main field: paramagnetic defects in solids;
other fields: off-center impurities,; phase transitions,; high-Tc superconductivity;
current research interest: defects in perovskite-type ferroelectrics,; photo-induced charge transfer in insulators,; microscopic origins for non-linear optical features;
technical skills: spectroscopy of solids, namely, electron paramagnetic resonance (EPR), photoluminescence, photoconductivity, optically detected magnetic resonance (ODMR), Raman spectroscopy;; also computer simulations, data acquisition methods and automation of experimental setups.


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     Interpretation was given for anomalous dynamics of inhomogeneous line shape (EPR and optical absorption) in the system of reorienting impurities affected by alternating electric field (off-center Co2+ in SrO).
     New type of maser-effect (inverse spin level population and stimulated emission) due to spin-flip tunneling of off-center paramagnetic ions under the action of alternating electric field has been obtained experimentally. Computer simulations support the model and give the values for tunneling matrix elements.
     Persistent spectral hole burning was found in optical absorption of Co2+ off-center impurities in SrO caused from their reorientations in excited state.
     New threshold-like behavior of the magnetic memory effects has been observed in bismuth-based high-Tc superconducting crystals by the investigations of low-field microwave absorption.
     The location of Cr levels in the band gap of SrTiO3 was found. It was shown that photoionization transitions play a dominating role in the mechanism of photoluminescence of Cr3+ ions under optical excitation in the visible (with photon energies markedly smaller than Eg). Long time persisting increase of the photoconductivity for the light with energy less than 2.1 eV was found as a result of previous illumination with higher photon energies.
     Orientation sensitive recharging of tetragonal FeK-Oi and FeTa-VO centers in KTaO3 under polarized optical irradiation was observed. It results in the pseudo-alignment of the centers in particular charge state. A phenomenological model involving photo charge transport was given, which allows for a semi-quantitative description of the experiments.

Papers in refereed journals and proceedings - 20; total - 39.
See reference list with abstracts.


interests	results	my teachers	friends
grants	papers	curriculum vitae	personal


interests	results	my teachers	friends
grants	papers	curriculum vitae	personal


interests	results	my teachers	friends
grants	papers	curriculum vitae	personal


interests	results	my teachers	friends
grants	papers	curriculum vitae	personal

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I speak Russian (native), English (fluent), and German. I like reliable work and I hate quickies of any kind. I am professional also in programming and I was responsible for a number of commercial projects as the leader of free-lance team.