Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 24: Spin Transport and Orbitronics, Spin-Hall Effects
MA 24.10: Vortrag
Mittwoch, 7. September 2022, 17:15–17:30, H37
Unified theory of itinerant transport in magnetic platforms based on the slave-boson formalism — •Ricardo Zarzuela1 and Jairo Sinova1,2 — 1Institut für Physik, Johannes Gutenberg Universität Mainz, D-55099 Mainz, Germany — 2Institute of Physics Academy of Sciences of the Czech Republic, Cukrovarnická 10, 162 00 Praha 6, Czech Republic
The slave-boson formalism, rooted in the idea that electron hopping in the lattice is accompanied by a backflow of spin excitations, has been widely used in the field of strongly correlated systems to describe metal-insulator transitions and high-Tc superconductivity, to name a few. It is also well suited to explore transport phenomena in spintronic platforms, since the spin exchange with the magnetic background can be easily incorporated into the representation of the electron operators. We show that the slave-boson approach to the Hubbard model for conduction electrons (near half filling) yields an effective low-energy long-wavelength theory for the itinerant transport in magnetic conductors. In particular, an emergent coupling between the magnetization current and the itinerant spin current is responsible for the spin-transfer physics as well as the topological Hall effect observed in magnetic systems. Our slave-boson approach does not require the adiabatic dynamics of the itinerant carriers, so our findings hold for any itinerant spin polarization. We also show that topological defects (e.g., magnetic vortices and magnetic disclinations) mediate both spin-transfer and topological Hall responses in the magnetic medium, which have not been observed experimentally yet.