Spin Polarons in Two-Dimensional Systems

Lattice and spin polarons in two dimensions

Polarons in quasi-one-dimensional systems

We discuss the nature of polaron excitations in two models of current interest in the study of quasi-one-dimensional materials: the coupled electron-phonon and molecularcrystal models. Using for definiteness parameters appropriate to trans-(CH)„, we show that, although qualitatively very similar, the two polarons differ quantitatively in many respects. We then consider the very weakly bound pol...

Spin, Orbital, and Spin-Orbital Polarons in Transition Metal Oxides

I give a brief overview of a polaron formation in three distinct transition metal oxides: (i) spin polaron when a hole is added to the antiferromagnetic (AF) ordered plane in La2CuO4, (ii) orbital polaron when a hole is added to the alternating orbital (AO) ordered plane in LaMnO3, and (iii) spin-orbital polaron when a hole is added to the AF and AO ordered plane in LaVO3. Comparison of the dis...

Quantum nanostructures in strongly spin-orbit coupled two- dimensional systems

Spin precession in inversion-asymmetric two-dimensional systems

We present a theoretical method to calculate the expectation value of spin in an inversion-asymmetric twodimensional (2D) system with respect to an arbitrarily spin-polarized electron state, injected via an ideal point contact. The 2D system is confined in a [001]-grown quantum well, where both the Rashba and the Dresselhaus spin-orbit couplings are taken into account. The obtained analytical r...