[HTML][HTML] Superconductivity in high-Tc and related strongly correlated systems from variational perspective: Beyond mean field theory

J Spałek, M Fidrysiak, M Zegrodnik, A Biborski - Physics Reports, 2022 - Elsevier
The principal purpose of this topical review is to single out some of the universal features of
high-temperature (high-T c) and related strongly-correlated systems, which can be …

Mixed singlet-triplet superconducting state within the moiré model applied to twisted bilayer

M Zegrodnik, A Biborski - Physical Review B, 2023 - APS
We analyze an analog of the tJU model as applied to the description of a single moiré flat
band of twisted WSe 2 bilayer. To take into account the correlation effects induced by a …

Topological superconductivity with mixed singlet-triplet pairing in moiré transition metal dichalcogenide bilayers

W Akbar, A Biborski, L Rademaker, M Zegrodnik - Physical Review B, 2024 - APS
We investigate strong coupling topological superconductivity in twisted moiré bilayer WSe 2.
Our approach is based on an effective tJ model with displacement-field-dependent complex …

High-temperature superconductivity in the two-dimensional t–J model: Gutzwiller wavefunction solution

J Kaczmarczyk, J Bünemann, J Spałek - New Journal of Physics, 2014 - iopscience.iop.org
A systematic diagrammatic expansion for Gutzwiller wavefunctions (DE-GWFs) proposed
very recently is used for the description of the superconducting (SC) ground state in the two …

Universal collective modes from strong electronic correlations: Modified theory with application to high- cuprates

M Fidrysiak, J Spałek - Physical Review B, 2021 - APS
A nonzero-temperature technique for strongly correlated electron lattice systems, combining
elements of both variational wave function (VWF) approach and expansion in the inverse …

Correlation-driven -wave superconductivity in Anderson lattice model: Two gaps

MM Wysokiński, J Kaczmarczyk, J Spałek - Physical Review B, 2016 - APS
Superconductivity in heavy-fermion systems has an unconventional nature and is
considered to originate from the universal features of the electronic structure. Here, the …

Gutzwiller wave-function solution for Anderson lattice model: Emerging universal regimes of heavy quasiparticle states

MM Wysokiński, J Kaczmarczyk, J Spałek - Physical Review B, 2015 - APS
The recently proposed diagrammatic expansion (DE) technique for the full Gutzwiller wave
function (GWF) is applied to the Anderson lattice model. This approach allows for a …

Coexistence of nematic order and superconductivity in the Hubbard model

J Kaczmarczyk, T Schickling, J Bünemann - Physical Review B, 2016 - APS
We study the interplay of nematic and superconducting order in the two-dimensional
Hubbard model and show that they can coexist, especially when superconductivity is not the …

Mixed singlet-triplet superconducting state within the moir\'e -- model as applied to the description of twisted WSe bilayer

M Zegrodnik, A Biborski - arXiv preprint arXiv:2302.13841, 2023 - arxiv.org
We analyze an analog of the $ t $-$ J $-$ U $ model as applied to the description of a single
moir\'e flat band of twisted WSe $ _2 $ bilayer. To take into account the correlation effects …

Many-body breakdown of indirect gap in topological Kondo insulators

MM Wysokiński, M Fabrizio - Physical Review B, 2016 - APS
We show that the inclusion of nonlocal correlation effects in a variational wave function for
the ground state of a topological Anderson lattice Hamiltonian is capable of describing both …