92 citations · 1.2k across the 70 of their papers we have counts for
61 papers · 1 filter
Character of Doped Holes in NdSrNiO
Tharathep Plienbumrung, Michael Schmid, Maria Daghofer +1
We investigate charge distribution in the recently discovered high- superconductors, layered nickelates. With increasing value of charge-transfer energy we observe the expecte…
Interplay between Zhang-Rice singlets and high-spin states in a model for doped NiO planes
Tharathep Plienbumrung, Maria Daghofer, Andrzej M. Oleś
Superconductivity found in doped NdNiO is puzzling as two local symmetries of doped NiO layers compete, with presumably far-reaching implications for the involved mechanism…
Orbital Rotations induced by Charges of Polarons and Defects in Doped Vanadates
Peter Horsch, Andrzej M. Oleś, Adolfo Avella
We explore the competiton of doped holes and defects that leads to the loss of orbital order in vanadate perovskites. In compounds such as LaCaVO spin…
Quantum phase transitions in the spin-1 Kitaev-Heisenberg chain
Wen-Long You, Gaoyong Sun, Jie Ren +2
Recently, it has been proposed that higher-spin analogues of the Kitaev interactions may also occur in a number of materials with strong Hund's and spin-orbit coupling. In th…
Origin of monoclinic distortion and its impact on the electronic properties in KO
Olga Sikora, Dorota Gotfryd, Andrzej Ptok +4
We use the density functional theory and lattice dynamics calculations to investigate the properties of potassium superoxide KO in which spin, orbital, and lattice degrees of f…
Quantum phase transitions in a spin-1 antiferromagnetic chain with long-range interactions and modulated single-ion anisotropy
Jie Ren, Wen-Long You, Andrzej M. Oleś
We study the phase diagram of spin-1 antiferromagnetic chain with isotropic antiferromagnetic interactions decaying with a power-law () accompanied by modu…
Tuning Crystal Field Potential by Orbital Dilution in Oxides
Wojciech Brzezicki, Filomena Forte, Canio Noce +2
We investigate the interplay between Coulomb driven orbital order and octahedral distortions in strongly correlated Mott insulators due to orbital dilution, i.e., doping by metal i…
Spectral properties of spin-orbital polarons as a fingerprint of orbital order
Krzysztof Bieniasz, Mona Berciu, Andrzej M. Oleś
Transition metal oxides are a rich group of materials with very interesting physical properties that arise from the interplay of the charge, spin, orbital, and lattice degrees of f…
Criticality and factorization in the Heisenberg chain with Dzyaloshinskii-Moriya interaction
Tian-Cheng Yi, Wen-Long You, Ning Wu +1
In this work, we address the ground state properties of the anisotropic spin-1/2 Heisenberg XYZ chain under the interplay of magnetic fields and the Dzyaloshinskii-Moriya (DM) inte…
Spin-orbital order in LaMnO: model study
Krzysztof Rościszewski, Andrzej M. Oleś
Using the multiband model and unrestricted Hartree-Fock approximation we investigate the electronic structure and spin-orbital order in three-dimensional MnO lattice such…
Magnon dressing by orbital excitations in ferromagnetic planes of KCuF and LaMnO
Mateusz Snamina, Andrzej M. Oleś
We show that even when spins and orbitals disentangle in the ground state, spin excitations are renormalized by the local tuning of orbitals in ferromagnetic planes of KC…
model and spin-orbital order in the vanadium perovskites
Krzysztof Rościszewski, Andrzej M. Oleś
Using the multi-band model and unrestricted Hartree-Fock approximation we investigate the electronic structure and spin-orbital order in three-dimensional VO lattice. The…
Quantum coherence in a compass chain under an alternating magnetic field
Wen-Long You, Yimin Wang, Tian-Cheng Yi +2
We investigate quantum phase transitions and quantum coherence in a quantum compass chain under an alternating transverse magnetic field. The model can be analytically solved by th…
Spin-orbital model of stoichiometric LaMnO with tetragonal distortions
Mateusz Snamina, Andrzej M. Oleś
The model developed for LaMnO addresses the spin-orbital order by superexchange and Jahn-Teller orbital interactions in the cubic (perovskite) symmetry up to now whereas real c…
Fingerprints of spin-orbital polarons and of their disorder in the photoemission spectra of doped Mott insulators with orbital degeneracy
Adolfo Avella, Andrzej M. Oleś, Peter Horsch
We explore the effects of disordered charged defects on the electronic excitations observed in the photoemission spectra of doped transition metal oxides in the Mott insulating reg…
Orbital Physics
Andrzej M. Oleś
A tutorial introduction into the principles of Orbital Physics in strongly correlated transition metal oxides.
Order in Quantum Compass and Orbital Models
Piotr Czarnik, Jacek Dziarmaga, Andrzej M. Oleś
We investigate thermodynamic phase transitions in the compass model and in orbital model on an infinite square lattice by variational tensor network renormalization (VTNR) in…
Orbiton-magnon interplay in the spin-orbital polarons of KCuF3 and LaMnO3
Krzysztof Bieniasz, Mona Berciu, Andrzej M. Oleś
We present a quasi-analytical solution of a spin-orbital model of KCuF, using the variational method for Green's functions. By analyzing the spectra for different partial bos…
Emergent phases in a compass chain with multisite interactions
Wen-Long You, Cheng-Jie Zhang, Weihai Ni +2
We study a dimerised spin chain with biaxial magnetic interacting ions in the presence of an externally induced three-site interactions out of equilibrium. In the general case, the…
Driving Topological Phases by Spatially Inhomogeneous Pairing Centers
Wojciech Brzezicki, Andrzej M. Oleś, Mario Cuoco
We investigate the effect of periodic and disordered distributions of pairing centers in a one-dimensional itinerant system to obtain the microscopic conditions required to achieve…
Overcoming the Sign Problem at Finite Temperature: Quantum Tensor Network for the Orbital Model on an Infinite Square Lattice
Piotr Czarnik, Jacek Dziarmaga, Andrzej M. Oleś
The variational tensor network renormalization approach to two-dimensional (2D) quantum systems at finite temperature is applied for the first time to a model suffering the notorio…
Spin-orbital order in undoped manganite LaMnO3 at finite temperature
Mateusz Snamina, Andrzej M. Oleś
We investigate the evolution of spin and orbital order in undoped LaMnO under increasing temperature with a model including both superexchange and Jahn-Teller interactions. We…
Green's function variational approach to orbital polarons in KCuF3
Krzysztof Bieniasz, Mona Berciu, Maria Daghofer +1
We develop an orbital, --like model of a single charge doped into a two-dimensional plane with ferromagnetic spin order and alternating orbital order, and present its s…
The Green function variational approximation: Significance of physical constraints
Krzysztof Bieniasz, Mona Berciu, Andrzej M. Oleś
We present a calculation of the spectral properties of a single charge doped at a Cu() site of the Cu-F plane in KCuF. The problem is treated by generating the equations…