37 citations · 148 across the 6 of their papers we have counts for
6 papers
Strong Effects of Cation Vacancies on the Electronic and Dynamical Properties of FeO
Urszula D. Wdowik, Przemysław Piekarz, Krzysztof Parlinski +2
We report pronounced modifications of electronic and vibrational properties induced in FeO by cation vacancies, obtained within density functional theory incorporating strong local…
Exotic spin orders driven by orbital fluctuations in the Kugel-Khomskii model
Wojciech Brzezicki, Jacek Dziarmaga, Andrzej M. Oleś
We study zero temperature phase diagram of the three-dimensional Kugel-Khomskii model on a cubic lattice using the cluster mean field theory and different perturbative expansions i…
Spin-Orbital Entanglement Emerging from Frustration in the Kugel-Khomskii Model
W. Brzezicki, A. M. Oleś
We investigate the zero-temperature phase diagrams of the bilayer square-lattice Kugel-Khomskii () model involving entangled and singlet phases using mean-field cluster approa…
Optical conductivity due to orbital polarons in systems with orbital degeneracy
Piotr Wróbel, Robert Eder, Andrzej M. Oleś
We consider the impact of orbital polarons in doped orbitally ordered systems on optical conductivity using the simplest generic model capturing the directional nature of either $t…
Entangled spin-orbital phases in the bilayer Kugel-Khomskii model
Wojciech Brzezicki, Andrzej M. Oleś
We derive the Kugel-Khomskii spin-orbital (SO) model for a bilayer and investigate its phase diagram depending on Hund's exchange and the orbital splitting . In th…
Spin-orbital resonating valence bond liquid on a triangular lattice: Evidence from finite-cluster diagonalization
Jiří Chaloupka, Andrzej M. Oleś
We investigate the ground state of the spin-orbital model for triply degenerate orbitals on a triangular lattice which unifies intrinsic frustration of spin and orbi…