The Institute

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.

The head of the Department is prof. dr hab. Tadeusz Kopeć.

Research

• 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

List of all scientific articles published by researchers from  the Division of Theory of Condensed Matter can be accessed here:  BASE of KNOWLEDGE DTCM.

2024

• R. Eder, P.  Wróbel, "Magnetic polarons in the Kondo lattice" Physical Review B 110 (2024) 035112
• T. Kopeć "Interaction-driven crossover from Mott insulator–superfluid criticality to Bose-Einstein condensation in a simple cubic lattice" Physical Review B 110 (2024) 144517
• J. Sznajd "Frustration—no frustration crossover and phase transitions in 2D spin models with zig-zag structures" Journal of Statistical Mechanics-Theory and Experiment 2024 (2024) 053202
• V. Apinyan, M. Sahakyan "Unusual spin-triplet superconductivity in monolayer graphene" European Physical Journal B 97 (2024) 75
• K. Bilińska, M. Winiarski "Machine Learning-Based Predictions of Power Factor for Half-Heusler Phases" Crystals 14 (2024) 354

2023

• M. Antkowiak, Ł. Kucharski, R. Lemański, G. Kamieniarz "Algorithms on low energy spectra of the Hubbard model pertinent to molecular nanomagnets" Concurrency and Computation-Practice & Experience 36 (2023) e7931
• V. Apinyan "Spontaneous Magnetization in the Finite-Size Two-Leg Ising Ladder in the External Magnetic Field" Recent Progress in Materials 05 (2023) 1
• K. Bilińska, D. Goles, M. Winiarski "A theoretical investigation of 18-electron half-Heusler tellurides in terms of potential thermoelectric value" European Physical Journal B 96 (2023) 131
• S. Anufriiev, T. Zaleski "Mixtures of ultracold atomic gases in optical lattices with nonzero pair or counterflow hopping" Low Temperature Physics 49 (2023) 267
• I. Gruss, J. Twardowski, M. Samsel-Czekała, J. Beznosiuk, C. Wandzel, K. Twardowska, R. Wiglusz "The isothermal Boltzmann–Gibbs entropy reduction affects survival of the fruit fly Drosophila melanogaster" Scientific Reports 13 (2023) 14166
• K. Singh, S. Dan, A. Ptok, T. Zaleski, O. Pavlosiuk, P. Wiśniewski, D. Kaczorowski "Superexchange interaction in insulating EuZn2P2" Physical Review B 108 (2023) 05440
• D. Stefańska, B. Bondzior, M. Winiarski, P. Dereń "Influence of the charge compensating agent on tunable emission of the Ba2MgWO6:Eu3+ double perovskite" Ceramics International 49 (2023) 16038

2022

•  V. Apinyan, T. Kopeć "Excitonic condensation and metal-semiconductor transition in AA bilayer graphene in an external magnetic field" Physical Review B 105 (2022) 184503
• R. Eder, P. Wróbel  "Channel order in the two-channel Kondo lattice" Physical Review B 105 (2022) 125133
• B. Grygiel, K. Patucha "Excitation spectra of strongly interacting bosons in the flat-band Lieb lattice" Physical Review B 106 (2022) 224514 
• A. Piekarska, T. Kopeć "Stability of the replica-symmetric solution in the off-diagonally-disordered Bose–Hubbard model" Journal of Statistical Mechanics-Theory and Experiment 2022 (2022) 073302
• J. Sznajd "Ising spin ladder with trimer rungs and next-nearest-neighbor coupling: frustration in physics and agent models" Journal of Statistical Mechanics-Theory and Experiment 2022 (2022) 023402
• M. Winiarski, D. Kowalska "Electronic structure of hexagonal REN (RE = Sc, Y, and Lu) materials" Materials Chemistry and Physics 292 (2022) 126794 

2021

• K. Sznajd-Weron, J. Sznajd, T. Weron "A review on the Sznajd model — 20 years after" Physica A-Statistical Mechanics and Its Applications 565 (2021) 125537
• V. Apinyan, T. Kopeć "Antiferromagnetic ordering and excitonic pairing in AA-stacked bilayer graphene" Physical Review B 104 (2021) 075426
• B. Grygiel, T. Zaleski "Momentum-resolved conductivity of strongly interacting bosons in an optical lattice" Physical Review B 104 (2021) 104511
• K. Kapcia, R. Lemański, M. Zygmunt "Extended Falicov–Kimball model: Hartree–Fock vs DMFT approach" Journal of Physics-Condensed Matter 33 (2021) 065602
• J. Matysiak, R. Lemański "Description of molecular nanomagnets by the multiorbital Hubbard model with correlated hopping" Physical Review B 104 (2021) 014431
• E. Piskorska-Hommel, M. Winiarski, M. Kurnatowska "Low temperature reducibility of Ce4+ ions in Ce0.7Yb0.2Pd0.1O2-δ: in situ XANES study" Materials Chemistry and Physics 257 (2021) 123852
• P. Ruszała, M. Winiarski, M. Samsel-Czekała "Electronic properties of La1−Tl N systems by ab initio calculations" Journal of Physics and Chemistry of Solids 159 (2021) 110274
• P. Ruszała, M. Winiarski, M. Samsel-Czekała, L.M. Tran, M. Babij, Z. Bukowski "Tilted Dirac cone gapped due to spin-orbit coupling and transport properties of a 3D metallic system CaIr2Ge2" Journal of Alloys and Compounds 858 (2021) 158260.
• J. Sznajd "From modeling of political opinion formation to two-spin statistical physics model" Journal of Statistical Mechanics-Theory and Experiment 2021 (2021) 013210

2020

• V. Apinyan, M. Sahakyan "Dirac's Spectrum from Newton’s Laws in Graphene" Recent Progress in Materials 2 (2020) 16
• V. Apinyan, T. Kopeć "High thermoelectric performance in excitonic bilayer graphene"  Physica E-Low-Dimensional Systems & Nanostructures 124 (2020) 114234 
• K.J. Kapcia, J. Krawczyk, R. Lemański "Extended Falicov-Kimball model at weak onsite and intersite Coulomb interactions" Condensed Matter Physics 23 (2020) 43706 
• A. Piekarska, T. Kopeć "Dynamical correlations and a quantum glass phase in a random hopping Bose-Hubbard model" Journal of Statistical Mechanics-Theory and Experiment 2020 (2020) 024001
• Robarts H.C., Millichamp T.E., Lagos D.A. [i in.] "Extreme Fermi Surface Smearing in a Maximally Disordered Concentrated Solid Solution" Physical Review Letters 124 (2020) 046402
• P. Wagner, P. Wróbel, R. Eder "Ferromagnetism in the Kondo-lattice" European Physical Journal B 93 (2020) 58
• M. Winiarski, D. Kowalska "Crystal structure of rare earth and group III nitride alloys by ab initio calculations" Scientific Reports 10 (2020) 16414

Staff