92 citations · 1.2k across the 70 of their papers we have counts for
9 papers · 1 filter
Quantum versus classical polarons in a ferromagnetic CuO-like chain
Krzysztof Bieniasz, Andrzej M. Oleś
We present an exact solution for an itinerant hole added into the oxygen orbitals of a CuO-like ferromagnetic chain. Using the Green's function method, the quantum polarons o…
Frustration and Entanglement in Compass and Spin-Orbital Models
Andrzej M. Oleś
We review the consequences of intrinsic frustration of the orbital superexchange and of spin-orbital entanglement. While Heisenberg perturbing interactions remove frustration in th…
Exact treatment of magnetism-driven ferroelectricity in the one-dimensional compass model
Wen-Long You, Guang-Hua Liu, Peter Horsch +1
We consider a class of one-dimensional compass models with antisymmetric Dzyaloshinskii-Moriya exchange interaction in an external magnetic field. Based on the exact solution deriv…
Spin-Orbital Order Modified by Orbital Dilution in Transition Metal Oxides: From Spin Defects to Frustrated Spins Polarizing Host Orbitals
Wojciech Brzezicki, Andrzej M. Oleś, Mario Cuoco
We study the substitution in transition metal oxides in the cases of doping at either or sites which realize orbital dilution. We derive the effectiv…
Exotic Spin Order due to Orbital Fluctuations
Wojciech Brzezicki, Jacek Dziarmaga, Andrzej M. Oleś
We investigate the phase diagrams of the spin-orbital Kugel-Khomskii model for increasing system dimensionality: from the square lattice monolayer, via the bilayer to the cub…
Hole propagation in the orbital compass models
Wojciech Brzezicki. Maria Daghofer, Andrzej M. Oleś
We explore the propagation of a single hole in the generalized quantum compass model which interpolates between fully isotropic antiferromagnetic (AF) phase in the Ising model and…