Nature of Orbital and Spin Rashba Coupling in the Surface Bands of SrTiO3 and KTaO3

Abstract

Tight-binding models for the recently observed surface electronic bands of SrTiO3 and KTaO3 are analyzed with a view to bringing out the relevance of momentum-space chiral angular momentum structures of both orbital and spin origins. Depending on the strength of electric field associated with inversion symmetry breaking at the surface, the orbital and the accompanying spin angular momentum structures reveal complex linear and cubic dependencies in the momentum k (linear and cubic Rashba effects, respectively) in a band-specific manner. Analytical expressions for the cubic orbital and spin Rashba effects are derived by way of unitary transformation technique we developed, and compared to numerical calculations. Due to the C4v symmetry of the perovskite structure the cubic Rashba effect appears as in-plane modulations.

References in corpus (2)

• Theory of spin-orbit coupling at LaAlO3/SrTiO3 interfaces and SrTiO3 surfaces
• Microscopic Theory of Rashba Interaction in Magnetic Metal

Cited by in corpus (6)

• Giant switchable Rashba effect in oxide heterostructures
• High-temperature large-gap quantum anomalous Hall insulator in ultrathin double perovskite films
• Gate control of superconductivity in mesoscopic all-metallic devices
• Rashba-like spin-orbit interaction and spin texture at the KTaO${}_{\text{3}}$ (001) surface from DFT calculations
• $d_{xz/yz}$ Orbital Subband Structures and Chiral Orbital Angular Momentum in the (001) Surface States of SrTiO${}_3$
• Tunable correlation effects of magnetic impurities by the cubic Rashba spin-orbit couplings