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Structure / Departments / Department for Quantum Statistics

Department for Quantum Statistics

By icmp_admin - Posted on 25 October 2010

Department for Quantum StatisticsThe department was founded in March 1980. The first head of the department was professor Ivan Vakarchuk (until September 1984). Professor Ihor V. Stasyuk has been the head of the department since March 1986. The department is coorganizer of regular international conferences on physics of ferroelectrics. The staff of the department consists of 10 scientists: 1 Dr.Sci. (Ihor Stasiuk), 8 Ph.D. (Roman Stetsiv, Andrij Shvaika, Oleh Velychko, Petro Glushak, Taras Mysakovych, Orest Hera, Oleh Vorobyov), junior researcher (Jurii Dublenych), 3 engineers and researchers (Vladimir Krasnov, Oleh Matveev, Oleh Menchyshyn).

The  head of the department - Corresponding member of the National Academy of Sciences of Ukraine 
Ihor Vasylyovych Stasyuk

The head of the department - Corresponding member of the National Academy of Sciences of Ukraine Ihor Vasylyovych Stasyuk

Born on September 23, 1938 in the town of Berezhany in Ternopil region. He graduated from Lviv University in 1959, Doctor of Science (1986), Professor (1987), corresponding member of NAS of Ukraine (1995), head of the department since 1986. He is the author of more than 500 papers on solid state theory and statistical theory of the many particle systems. Major research areas: systems with strong electronic correlations, phase transitions in complex crystals, ferroelectrics and molecular systems with hydrogen bonds, effects induced by external fields in crystals, ionic (protonic) conductors.

Phone: (032) 2761161; E-mail: ista[REPLACE_THIS_WITH_AT_SIGN]

Research fields

  • development of analytical methods in the theory of strongly correlated electronic systems;
  • investigation of their energy spectrum, thermodynamics and dynamics, transport phenomena;
  • description of phase transitions and effects of bistability and study of the dynamics of crystalline systems with locally anharmonic structure elements;
  • theory of phenomena associated with transport of ions, the intercalation processes and phase transitions to the superionic state in crystals;
  • modelling of phase transitions of order-disorder type and analysis of effects caused by external fields (electric field, hydrostatic pressure) in complex ferroelectric crystals;
  • quantum description of complex formation and adsorption in aqueous solutions and on the surface of modified silicates with radionuclide ions.

Objects of research: compounds with transition and rare earth elements, valence-change systems, high temperature superconductors, ionic (superionic) conductors intercalated crystal structures, ferroelectrics with hydrogen bonds; radionuclide ions in aqueous solutions and on the surface of adsorbents.

Scientific collaboration

The department is carrying out joint research with scientists from other institutions and universities in Ukraine and abroad, including researchers from the National University "Lviv Polytechnic", Drogobych State Pedagogical University, Ternopil National Technical University, Institute of Experimental Physics of Wroclaw University (Prof. Z. Czapla, Poland), Department of Physics at Georgetown University (Prof. J. Freericks, USA), Center for linear accelerator at Stanford University (Prof. T. Devereaux, USA), Institute of Physics of Zagreb (Prof. Zlatic, Croatia). Close collaboration with research groups (Prof. B. Hilczer) of Institute of Molecular Physics PAN (Poznan, Poland) is maintained.


Over the past 10 years, the researchers of the department have published about 400 scientific works, including 125 articles in national and foreign journals. During this period the department has participated in 85 conferences. Among recent publications:

  1. N.I.Pavlenko, I.V.Stasyuk. The effect of proton interactions on the conductivity behaviour in systems with superionic phases // J. Chem. Phys. 114 (2001) 4607.
  2. I.V.Stasyuk, R.Ya.Stetsiv, Yu.V.Sizonenko. Dynamics of charge transfer along hydrogen bond // Condens. Matter Phys. 5 (2002) 685.
  3. I.V.Stasyuk, T.S.Mysakovych. Susceptibility and phase transitions in the pseudospin-electron model at weak coupling // Acta Phys. Polon. 34 (2003) 765.
  4. A.M.Shvaika. Dynamical mean-field theory of correlated hopping: A rigorous local approach // Phys. Rev. B. 67 (2003) 075101.
  5. I.Stasyuk, Z.Czapla, S.Dacko, O.Velychko. Dielectric anomalies and phase transition in glycinium phosphite crystal under the influence of a transverse electric field // J. Phys.: Condens. Matter 16 (2004) 1963.
  6. A.M.Shvaika, O.Vorobyov, J.K.Freericks, T.P.Devereaux. Resonant enhancement of inelastic light scattering in strongly correlated materials // Phys. Rev. Lett. 93 (2004) 137402.
  7. I.V.Stasyuk , O.V.Velychko. Theory of Rochelle salt: beyond the Mitsui model // Ferroelectrics 316 (2005) 51.
  8. I.Stasyuk, Yu.Dublenych. Phase transitions and phase separations in an S=1 pseudospin-electron model: Application of the model to the intercaled crystals // Phys. Rev. B. 72 (2005) 224209.
  9. I.V.Stasyuk, O.B.Hera. Mott transition in the asymmetric Hubbard model at half-filling within dynamical mean-field theory // Eur. Phys. J., 48 (2005), № 5, 339.