Division of Theory of Condensed Matter deals with theory of strongly correlated systems (including the mechanisms responsible for high temperature superconductivity), as well as with the determination of the electronic structure of solids. Another interest is superfluidity in bosonic systems of ultracold atomic gases in optical lattices and investigation of magnetic phase transitions using fluctuational theory of critical phenomena.

 Pracownicy Oddziału Teorii Materii Skondensowanej


  • Theoretical studies of the dependence of the critical temperature on the crystal structure of layered high-temperature superconductors.
  • Studies of quantum critical behavior near the Mott transition in fermion systems with strong Coulomb interaction.
  • Modelling of possible charge, spin and orbital orderings in systems of strongly correlated electrons using analytical methods and computer simulations.
  • Determination of the effects of frustration and anisotropy on the phase transitions in two-dimensional quantum magnetic systems using the renormalization group method.
  • Determination of electronic structure of solids using ab initio methods.
  • Theoretical reconstruction of the Fermi surface on the basis of positron emission spectroscopy data using Fourier analysis.
  • Studies of superfluid phase transitions in systems of bosons in optical lattices dependence on lattice geometry and external fields.
  • Investigation of excitonic superfluidity.

Important publications in 2005-2015:

  • T. A. Zaleski and T.K. Kopeć: Dependence of the Superconducting Critical Temperature on the Number of Layers in a Homologous Series of High-TC Cuprates. Phys. Rev. B 71 (2005) 014519 (14).
  • R. Lemański: Model of Charge and Magnetic Order Formation in Itinerant Electron Systems. Phys. Rev. B 71 (2005) 035107 (7).
  • T. A. Zaleski and T. P. Polak: Synthetic Magnetic Field Effects on Neutral Bosonic Condensates in Quasi-Three-Dimensional Anisotropic Layered Structures. Phys. Rev. A 83 (2011) 023607 (6).
  • T.K. Kopeć: Critical Charge Instability on the Verge of the Mott Transition and the Origin of Quantum Protection in High-TC Cuprates. Phys. Rev. B 73 (2006) 104505 (21).
  • J. Sznajd: Effects of Interchain Frustration on the Phase Transition in Two-Dimensional Spin Systems. Phys. Rev. B 76 (2007) 092405 (4).
  • J. Sznajd: Renormalization of Magnetic Chains in a Field: Isothermal Magnetocaloric Effect. Phys. Rev. B 78 (2008) 214411 (8).
  • P. Wróbel and A.M. Oleś: Ferro-Orbitally Ordered Stripes in Systems with Alternating Orbital Order. Phys. Rev. Lett. 104 (2010) 206401 (4).
  • M. Samsel-Czekała: Electronic Structure and Fermi Surface of UNZ (Z = Se and Te) by ab initio Calculations. Phys. Rev. B 81 (2010) 195115 (7).
  • G. Kontrym-Sznajd, H. Sormann, and E. Boroński: General Properties of Electron–Positron Momentum Densities. Phys. Rev. B 85 (2012) 245104 (9).
  • V. Apinyan and T. K. Kopeć: Excitonic Phase Transition in the Extended Three-Dimensional Falicov-Kimball Model. J. Low Temp. Phys. 176 (2014) 27−63.