Magnetic Skyrmionic Polarons

TL;DR

This paper introduces magnetic skyrmionic polarons, a new quasiparticle formed by an electron trapped in a skyrmion spin texture in a 2D electron gas with strong Rashba coupling, exhibiting unique charge, spin, and Hall effects.

Contribution

It presents the theoretical prediction and analysis of magnetic skyrmionic polarons, including their formation conditions, dynamics, and potential realization in semiconductors with large Rashba spin-orbit coupling.

Findings

Existence of stable magnetic skyrmionic polarons under certain parameters.

Demonstration of a Hall effect due to skyrmion chirality.

Potential realization in GeMnTe semiconductors.

Abstract

We study a two-dimensional electron gas exchanged-coupled to a system of classical magnetic ions. For large Rashba spin-orbit coupling a single electron can become self-trapped in a skyrmion spin texture self-induced in the magnetic ions system. This new quasiparticle carries electrical and topological charge as well as a large spin, and we named it as magnetic skyrmionic polaron. We study the range of parameters; temperature, exchange coupling, Rashba coupling and magnetic field, for which the magnetic skyrmionic polaron is the fundamental state in the system. The dynamics of this quasiparticle is studied using the collective coordinate approximation, and we obtain that in presence of an electric field the new quasiparticle shows, because the chirality of the skyrmion, a Hall effect. Finally we argue that the magnetic skyrmionic polarons can be found in large Rashba spin-orbit coupling semiconductors as GeMnTe.