The Institute

Division of Theory of Condensed Matter explores fundamental phase-transition phenomena in strongly correlated systems—ranging from high-temperature superconductivity and quantum magnetism to bosonic superfluidity—using a combination of analytical, ab initio and computational methods..

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

Research

• Correlated‐electron and quantum‐critical phenomena:
  Modeling charge, spin and orbital ordering, quantum-critical behavior near Mott transitions, and frustration- and anisotropy-driven phase transitions in low-dimensional magnets.

• Superconductivity and superfluidity:
  Investigation of layered high-temperature superconductors, bosonic superfluids in optical lattices, and excitonic superfluid phases under varying geometries and external fields.
  
  
• Electronic structure, microscopic properties and spectroscopy:
  Ab initio determination of solid‐state electronic properties and reconstruction of Fermi surfaces from spectroscopic data.
  
  
• Frustration and collective dynamics:
  Analytical and computational studies of frustrated spin systems (2D lattices, ladders and zig-zag structures with multi-spin interactions) and Sznajd-type agent-based models of opinion dynamics, including crossover anomalies and phase-transition behavior.

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