Magnetotransport of Functional Oxide Heterostructures Affected by Spin-Orbit Coupling: A Tale of Two-Dimensional Systems

Oxide heterostructures allow for detailed studies of 2D electronic transport phenomena. Herein, different facets of magnetotransport in selected spin-orbit-coupled systems are analyzed and characterized by their single-band and multiband behavior, respectively. Experimentally, temperature and magnetic field dependent measurements in the single-band system BaPbO3/SrTiO3 reveal strong interplay of weak antilocalization (WAL) and electron-electron interaction (EEI). Within a scheme which treats both, WAL and EEI, on an equal footing a strong contribution of EEI at low temperatures is found which suggests the emergence of a strongly correlated ground state. Furthermore, now considering multiband effects as they appear, e.g., in the model system LaAlO3/SrTiO3, theoretical investigations predict a huge impact of filling on the topological Hall effect in systems with intermingled bands. Already weak band coupling produces striking deviations from the well-known Hall conductivity that are explainable in a fully quantum mechanical treatment which builds upon the hybridization of intersecting Hofstadter bands.

Automated summary

Oxide heterostructures are able to study in detail 2D electronic transport phenomena, with different spin-orbit-coupled systems exhibiting characteristic magnetotransport behavior. Experimental results show strong interplay between weak antilocalization (WAL) and electron-electron interaction (EEI) in single-band systems, while theoretical investigations predict significant impact of band filling on the topological Hall effect in multiband systems.