92 citations · 1.2k across the 70 of their papers we have counts for
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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…
Stripe Phases in Layered Nickelates
Krzysztof Rościszewski, Andrzej M. Oleś
To describe quasi two-dimensional nickelates we introduce an effective Hamiltonian for electrons which includes the kinetic energy, on-site Coulomb interactions, spin-spin an…
Entangled Spin-Orbital Phases in the d Model
Wojciech Brzezicki, Andrzej M. Oleś
We investigate the phase diagrams of the spin-orbital Kugel-Khomskii model for a bilayer and a monolayer square lattice using Bethe-Peierls-Weiss method. For a bilayer we obt…
Spin-Orbital Liquid on a Triangular Lattice
Andrzej M. Oleś, Jiří Chaloupka
Using Lanczos exact diagonalization of finite clusters we demonstrate that the spin-orbital model for triply degenerate orbitals on a triangular lattice provides an…
Von Neumann Entropy Spectra and Entangled Excitations in Spin-Orbital Models
Wen-Long You, Andrzej M. Oleś, Peter Horsch
We consider the low-energy excitations of one-dimensional spin-orbital models which consist of spin waves, orbital waves, and joint spin-orbital excitations. Among the latter we id…